Question

A body of mass 4 kg moving on a horizontal surface with an
initial velocity of 6 ms⁻¹ comes to rest after 3 seconds. If
one wants to keep the body moving on the same surface
with the velocity of 6 ms⁻¹, the force required is
(a) Zero (b) 4 N
(c) 8 N (d) 16 N

Answer 1

Answer:

(d) is your answer.

Have a nice day

Answer 2

From above figure

A→B

u = 4m/s v=0 t=2sec a=?

v=u+at

0=4+a(2)

$a = - 2 \frac{m}{ {s}^{2} }$

so,

Force = m a

= 2 × 2

= 4N

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