Question

# A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/s comes to rest after 2 s. If one wants to keep this body moving on the same surface with a velocity of 4 m/s, the force required is:

A
8 N
B
4 N
C
Zero
D
2 N

Solution

## The correct option is B 4 Ngiven $$u = 4\dfrac{m}{s}$$       &     $$t=2s$$$$v = 0$$from$$v = u + at$$$$u = -at$$$$4 = -a(2)$$$$a = -2\dfrac{m}{s^2}$$ as the acceleration direction is opposite the sign is negative$$F = ma = 2(2) =4N$$Physics

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