Physics (2017) Discuss

A constant force of 5N acts for 5 seconds on a mass of 5kg initially at...

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Question 31
A

125kgms-1

B

25kgms-1

C

15kgms-1

D

0kgms-1

Explanation

Impulse = momentum

Impulse = Force (f) \(\times\) time (t)

Momentum = mass (m) \(\times\) velocity (v)

Ft = Final momentum - initial momentum

FT = mv - mu

Since it is initially at rest u = 0

5 x 5 = mv ? m(0)

25 = mv

Final momentum = 25kgms\(^{-1}\)


Correct option: B

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