Question

5.A body of mass 2 kg moving on a horizontal
surface with an initial velocity of 4 m/sec comes to
rest after 2 sec. If one wants to keep this body
moving on the same surface with a velocity of 4
m/sec, the force required is
(a) 8 N(b)
(c) Zero
(d) 2 N
4N​

Answer 1

Answer:

answer is (c) 2N

Explanation:

with initial velocity and time we can find acc.as

v=u+at

0=4+2*a

-4=2a

a=-2

with acc we can get force as

F=ma

F=2*2

=4N