Question

A 0.50 kg croquet ball is initially at rest on the grass. When the ball is

Answer 1

Answer:

(a) 1.6 Ns

(b) 6.95ms

Explanation:

mass of ball, m = 0.5 kg

initial velocity, u = 0

force, F = 230 N

final speed, v = 3.2 m/s

(a) According to the formula of momentum

The change in momentum = m (v - u) = 0.5 (3.2 - 0) = 1.6 Ns

(b) According to the Newton's second law, the force acting on the ball is rate of change of momentum of ball. let the time is t.

$F =\frac{m(v-u)}{t}\\\\230 =\frac{1.6}{t}\\\\t =6.95\times 10^{-3} s = 6.95 ms$