A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: - Noon Academy

A canon ball of mass 500g is fired with a speed of 15m/s^-1. Find:

Class 10 | ICSE | Physics | Selina | Work Energy

A canon ball of mass 500g is fired with a speed of 15m/s^-1. Find:

(i) its kinetic energy and

(ii) its momentum.

Solutions:

According to the question –

Mass of cannon ball is 500 g = 0.5 kg

Speed, v is 15 m / s

(a) from the expression of the kinetic energy of ball, we have –

= 1 / 2 × mass × (velocity)²

= 1 / 2× 0.5 × (15)² = 1 / 2 × 0.5 × 225

Kinetic energy = 56.25J

(b) Momentum of the ball is written as –

P = mass × velocity

= 0.5 × 15 = 7.5 kgm/s

i

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