Question

a force of 40N acts on a mass of 4kg at rest. calculate its velocity and momentum at the end up of 10s. ​

Answer 1

Explanation:

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