Question

An object of mass 100 kg is accelerated uniformly from a velocity of 5 ms⁻¹ to 8 ms⁻¹ in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

Answer 1

Mass of the body = 100kg

The initial velocity of the body = 5m/s

The final velocity of the body = 8m/s

Time = 6s

The initial momentum of the body = Mass × Initial velocity of the object

= 100 × 5

= 500 kgm/s

Momentum of the body later = 100 × 8

= 800 kgm/s

Force (F) = `"Momentum change"/"Time"`

= `(800-500)/6`

= `300/6`

= `100/2`

Force = 50N