Question

HOW MUCH WORK IS NEEDED TO BE DONE ON A BALL OF MASS 50 G TO GIVE IT A MOMENTUM OF 500G/CM

Answer 1

Mass of the ball, m = 50 g = 0.05 kg

Initial velocity, u = 0

Final momentum = 500 g cm/s = 500 (10^-3 kg)(10^-2 m/s) = 5 × 10^-3 kg m/s

Final velocity, v = (Final momentum)/mass = (5 × 10^-3)/(0.05) = 0.1 m/s

So, the change in KE of the ball is,

½ × m × v² – ½ × m × u²

= ½ × 0.05 × 0.1² - ½ × 0.05 × 0

= 0.0025 J