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
B
25m
C
50m
D
75m
E
100m

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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