A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find: (

1.	A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find: (i) its kinetic energy and (ii) its momentum.
Answer» Mass of canon ball = 500g = 0.5 kg Speed, v = 15m/s (a) Kinetic energy of ball = 1/2 × mass x (velocity)² = 1/2 ×0.5 ×(15)² = 1/2 ×0.5 ×225=56.25J (b) Momentum of the ball = mass × velocity = 0.5 × 15 = 7.5 kgm/s

A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find: (i) its kinetic energy and (ii) its momentum.

Answer»

Mass of canon ball = 500g = 0.5 kg

Speed, v = 15m/s

(a) Kinetic energy of ball = 1/2 × mass x (velocity)²

= 1/2 ×0.5 ×(15)²

= 1/2 ×0.5 ×225=56.25J

(b) Momentum of the ball = mass × velocity

= 0.5 × 15 = 7.5 kgm/s