Q33 of 139 Page 41

Explain the meaning of the following equation of motion :

v = u + at


where symbols have their usual meanings.

final velocity is equal to sum of the initial velocity and product of acceleration and time.


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31

Draw a velocity-time graph to show the following motion :

A car accelerates uniformly from rest for 5 s; then it travels at a steady velocity for 5 s.

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The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell you about

(a) the train’s velocity, and


(b) about its acceleration?

 33

A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, what is the value of acceleration?

 34

Derive the formula : v = u + at; where

the symbols have usual meanings.