Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 20

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IMPORTANT

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A particle is projected towards the north with speed $20 m s^{- 1}$ at an angle $45^{o}$ with horizontal. Ball gets horizontal acceleration of $7.5 m s^{- 2}$ towards east due to wind. Range of the ball will be

(Take $g = 10 m s^{- 2}$ )

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Important Questions on Kinematics

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 21

The figure shows three vectors $\vec{a}, \vec{b}$ and $\vec{c}$ . Here, $R$ is the midpoint of $P Q$ . Then which of the following relations is correct?

Question Image

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 22

The

x

and

y

coordinates of a particle at any time

t

are given by,

x = 7 t + 4 t^{2}

and

y = 5 t

, where,

x

and

y

are in

m

and

t

in

s

. The acceleration of the particle at

5 s

is

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 23

A body is having an initial velocity of

(\hat{i} + 2 \hat{j}) m s^{- 1}

, where

\hat{i}

is along the ground and

\hat{j}

is along vertically upward. If

g = 10 m s^{- 2}

, then choose the equation of trajectory,

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 24

Given,

\vec{a} + \vec{b} + \vec{c} = 0

. Out of the three vectors

\vec{a}

,

\vec{b}

and

\vec{c}

two are equal in magnitude. The magnitude of the third vector is

\sqrt{2}

times that of either of the two have equal magnitude. The angles between the vectors are

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 25

The vectors

\vec{A}, \vec{B}

and

\vec{C}

are such that

|\vec{A}| = |\vec{B}|, |\vec{C}| = \sqrt{2} |\vec{A}|

and

\vec{A} + \vec{B} + \vec{C} = 0

. The angles between

\vec{A}

and

\vec{B}, \vec{B}

and

\vec{C}

, respectively, are,

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 26

A particle is moving in an

x - y

plane at

2 m s^{- 1}

along

x -

axis.

2 s

later, its velocity is

4 m s^{- 1}

in a direction making

60 °

with positive

x -

axis. Its average acceleration for this period of motion is

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 27

A ball is projected at an angle of

30 °

above with the horizontal from the top of a tower and strikes the ground in

5 s

at an angle of

45 °

with the horizontal. Find the speed with which it was projected.

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Physics Crash Course JEE Main>Chapter 2 - Kinematics>Level 2>Q 28

A particle is projected from the ground with velocity

v

, at an angle

θ

to the horizontal. The average velocity of the particle between the point of projection and the maximum height of projectile is