Two bodies A and B are 10 km apart such that B is to the south of A. A and B start moving with the same speed 20 km/hr eastward and northward respectively then find. N (a) relative velocity of A w.r.t. B. W/ E (b) minimum separation attained during motion (c) time elapsed from starting, to attain minimum separation.

Initially the velocity of A and B is 20 km / h In eastward and northward direction, a Now, reverse the and superimpose B v A → = 20 , v B → = 20 v r e g = 20 2 + 20 2 = 20 2 km / h in south east direction b Now, for minimum separation B C Draw a perpendicular on resultant vector line, sin 45 ° = B C A B ⇔ B C = 10 × 1 2 = 10 2 km c cos 45 ° = d 10 ⇒ d = 10 2 km t = d v = 10 2 20 2 = 1 4 h = 15 minutes

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Two trains A and B each of length 50 m, are moving with constant speeds. If one train A overtakes the other in 40s, while crosses the other in 20s. Find the speeds of each train.

Important Questions on Kinematics

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 22

Two trains

A

and

B

of length

400 m

each are moving on two parallel tracks with a uniform speed of

72 k m h^{- 1}

in the same direction, with

A

ahead of

B

. The driver of

B

decides to overtake

A

and accelerates by

1 m / s^{2}

. If after

50 s

, the guard of

B

just brushes past the driver of

A

, what was the original distance between them?

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 23

A boy standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to

49 m / s

. How much time does the ball take to return to his hands? If the lift starts moving up with a uniform speed of

5 m / s

and the boy again throws the ball up with the maximum speed he can, how long does the ball take to return to his hands?

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 24

A man ’A moves in the north direction with a speed 10 m/s and another man B moves in E–30°–N with 10 m/s. Find the relative velocity of B w.r.t. A.

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 25

A and B are moving with the same speed 10 m/s in the directions E–30°–N and E–30°-S respectively. Find the relative velocity of A w.r.t. B.

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 26

Two bodies A and B are 10 km apart such that B is to the south of A. A and B start moving with the same speed 20 km/hr eastward and northward respectively then find. N

Question Image
(a) relative velocity of A w.r.t. B. W/ E
(b) minimum separation attained during motion
(c) time elapsed from starting, to attain minimum separation.

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 27

Rain is falling vertically with a speed of

30 m s^{- 1}

. A woman rides a bicycle with a speed of

10 m s^{- 1}

in the north to south direction. What is the direction in which she should hold her umbrella?

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 28

A man is running up hill with a velocity

(2 \hat{i} + 3 \hat{j})

m/ s w.r.t. ground. He feels that the rain drops are falling vertically with velocity 4 m/s. If he runs down hill with same speed, find v_rm.

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Beta Question Bank for Medical: Physics>Chapter 4 - Kinematics>Exercise (Conceptual Questions)>Q 29

A body is projected with velocity $u_{1}$ from point $A$ as shown in the figure. At the same time, another body is projected vertically upwards with a velocity $u_{2}$ from point $B$ . What should be the value of $\frac{u_{1}}{u_{2}}$ for both bodies to collide?

Question Image

Two trains A and B each of length 50 m, are moving with constant speeds. If one train A overtakes the other in 40s, while crosses the other in 20s. Find the speeds of each train.

Important Questions on Kinematics

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