Question

a force of 0.4 Newton acts on a mass of 4 kg at rest calculate its velocity and Momentum at the end of 10 second​

Answer 1

answer : velocity = 1m/s and momentum = 4 kgm/s

given, mass of object, m = 4 kg

force acting on object, F = 0.4 N

we know, F = ma

so, 0.4 N = 4 kg × a

⇒a = 0.1 m/s²

hence, acceleration of the object is a = 0.1 m/s²

initial velocity of object, u = 0

velocity of object after t = 10s , v = u + at

⇒v = 0 + 0.1 × 10s = 1 m/s

momentum at the end of t = 10s, P = mv

= 4kg × 1 m/s = 4 kg m/s

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Answer 2

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given, mass of object, m = 4 kg

force acting on object, F = 0.4 N

we know, F = ma

so, 0.4 N = 4 kg × a

⇒a = 0.1 m/s²

hence, acceleration of the object is a = 0.1 m/s²

initial velocity of object, u = 0

velocity of object after t = 10s , v = u + at

⇒v = 0 + 0.1 × 10s = 1 m/s

momentum at the end of t = 10s, P = mv

= 4kg × 1 m/s = 4 kg m/s