The graph given below shows how the speed of a car changes with time. Which part of the graph represents varying retardation?

The motion of the body from the point C to D has varying retardation. Note: In the graph, we can see that the important points like the starting point of the motion, the point where the motion type changes etc. are marked with A , B , C & D . From A to B , the motion is uniformly accelerated, from B to C , the motion is uniform and from C to D , it is non-uniform accelerated with the acceleration being negative.

The graph given below shows how the speed of a car changes with time. Find the distance traveled in the first eight hours.

We know that distance traveled in a speed-time graph is the area of the graph. In the graph, OA = 10 km / hr , BM = 35 km / hr OM = 3 hr , MN = 5 hr ⇒ s = a r □ O A B M + a r □ M B C N ⇒ s = 1 2 O A + B M × O M + B M × M N ⇒ s = 1 2 10 + 35 3 + 35 × 5 ⇒ s = 67 . 5 + 175 ⇒ s = 242 . 5 km

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Essentials of PHYSICS Class IX>Chapter 1 - Motion>Assignment

Assignment

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Priyanka B Physics Solutions for Exercise - Assignment

Simple step-by-step solutions to Assignment questions of Motion from Essentials of PHYSICS Class IX. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.