A constant force of n acts for a seconds on a m... - JAMB Physics 2017 Question
A constant force of %n acts for a % 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: 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\(^{-1}\)
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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