Q19 of 24 Page 31

Can the direction of velocity of an object reverse when it’s acceleration is constant? If so give an example; if not, explain why.

Yes. Direction of velocity of an object can be reversed when it’s acceleration is constant.


For example: When we throw a ball upward, it’s acceleration will be due to gravity i.e. 9.8 m/s2 in downward direction.


After reaching highest point, its direction will be reversed while its acceleration will remain same i.e. due to gravity.


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17

What do you mean by constant acceleration?

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When the velocity is constant, can the average velocity over any time interval differ from instantaneous velocity at any instant? If so, give an example; if not explain why.

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A point mass starts moving in a straight line with constant acceleration “a”. At a time t after the beginning of motion, the acceleration changes sign, without change in magnitude. Determine the time t0 from the beginning of the motion in which the point mass returns to the initial position.

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Consider a train which can accelerate with an acceleration of 20cm/s2 and slow down with deceleration of 100cm/s2. Find the minimum time for the train to travel between the stations 2.7 km apart.