A force of 14 N acts on a 5 kg object for 3 seconds.

a. What is the object's change in momentum?

b. What is the object's change in velocity?

Answer: a) 42Nm b) 8.4m/s

Explanation:

Impulse is defined as object change in momentum.

Since Force = mass * acceleration

F = ma

Acceleration is the rate of change in velocity.

F = m (v-u) / t

Cross multiply

Ft = m (v-u)

Since impulse = Ft

and Ft = m (v-u) ... (1)

The object change in velocity (v-u) = Ft/m from eqn 1

Going to the question;

a) Impulse = Force (F) * time (t)

Given force = 14N and time = 3seconds

Impulse = 14*3

Impulse = 42Nm

b) The object change in velocity (v-u) = Ft/m where mass = 5kg

v-u = 14*3/5

Change in velocity = 42/5 = 8.4m/s