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Question

A block of mass $$2\ kg$$ starts moving with initial speed of $$10\ m/s$$ and accelerates at $$-2 m/s^2$$. How far does the object travel before coming to rest? 


A
10m
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B
25m
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C
50m
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D
75m
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E
100m
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Solution

The correct option is B $$25 m$$
Given that: $$m=2 \ kg; u=10\ m/s; a=-2\ m/s^2$$

Using third equation of motion:
$$\Rightarrow v^2=u^2+2aS$$
$$\Rightarrow 0=10^2+2(-2)S$$
$$\Rightarrow S=\dfrac{100}{4}=25 \ m$$

Physics

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