A constant force of 5N acts for a 5 seconds on a mass of 5kg initially at rest. Calculate the final momentum

A constant force of 5N acts for a 5 seconds on a mass of 5kg initially at rest. Calculate the final momentum
A. 125kgms−1
B. 25kgms−1
C. 15kgms−1
D. 0kgms−1

Correct Option: Answer is B
Impulse = momentum

Impulse = Force (f) × time (t)

Momentum = mass (m) × velocity (v)

∴ Ft = Final momentum – initial momentum

FT = mv – mu

Since it is initially at rest u = 0

∴ 5 × 5 = mv − m(0)

25 = mv

∴ Final momentum = 25kgms−1

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