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Question

A body starts from rest at time t=0, accelerates uniformly and travels 320 m in 4 s. Find its velocity at time t=10s.

A
40 m/s
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B
400 m/s
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C
200 m/s
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D
20 m/s
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Solution

The correct option is B 400 m/s
Given:
Distance travelled, s=320m.
Time, t=4s
Initial velocity, u=0 (as the body starts from rest)

Using the equation of motion,
s=ut+12at2
320=0+12×a×42
a=3208=40 m/s2

So, velocity v after 10 s can be found by:
v=u+at
v=0+40×10
v=400 m/s

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