Question

a body is moving with a velocity of 10m/s stops after 2 sec. Find the initial and final momentum and the force acting on it. If the body weighs 5 kg.

Answer 1

Mass of the body = 5 kg

Initial velocity (u) = 10 m/s

Final velocity (v) = 0 m/s

Initial momentum = mu = 5 × 10 = 50 kg m/s

Final momentum = mv = 5 × 0 = 0 kg m/s

Force = Rate of change of momentum

Change in momentum = 50 - 0 = 50 kg m/s

Time taken = 2 seconds

$Force = \frac{50}{2}$

Force = 25 N

Hence, the force required is 25 N

Answer 2

Answer:

initial momentum:

m*u=5*10=50kg.m/s.

final momentum:

m*v=5*0=5kg.m/s.

To find force, first we need to find acceleration

a=v-u/t

0-10/2

5m/s square

F=ma

=5*5

=25N.

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