Question

An object of mass 20 kg is accelerated uniformly from the velocity of 36 kilometre per hour to 54 km per hour in 25 second calculate the initial and final momentum of the object also find the magnitude exerted by the object

Answer 1

Momentum = mass × Velocity

We first convert the velocity to m/s as follows

36 × 5/18 = 10m/s

54 × 5/18 = 15 m/ s

Initial momentum = 10 × 20 = 200 Kgms⁻¹

Final momentum = 15 × 20 = 300 Kgms⁻¹

Force = mass × Acceleration

Acceleration = (15 - 10) / 25

5 / 25 = 0.2 m/s²

Force = mass × Acceleration

20 × 0.2 = 4N