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Question

A body moves with initial velocity $$10ms^{-1}$$. If it covers a distance of $$20m$$ in $$2s$$, then acceleration of the body is 


A
Zero
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B
10ms2
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C
5ms2
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D
2ms2
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Solution

The correct option is A Zero
Suppose the acceleration is $$a$$ then using the second equation of motion, $$s=ut+\dfrac{1}{2}at^2$$
and putting $$t=2sec$$ and $$u=10m/s$$ 
we get $$20=10\times 2+a\times 2$$
or $$a=0$$ that is $$uniform $$ motion.

Physics

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