Question

A ball of mass 10kg is initially moving with a velocity of 50m/s. On applying a constant forv=ce on the ball for 2s, it acquires a velocity of 70m/s. Calculate: a) the initial momentum of the ball b)the final momentum of the ball c)the acceleration of the ball d) force applied on the ball

Answer 1

m = 10 kg u = 50 m/s v = 70 m/s t = 2s a = ? F = ? (a) Pi = m•u . = (10•50)kg m/s . = 500 kg m/s (b) Pf = m•v . = (10•70) kg m/s . = 700 kg m/s (c) a = (v-u)/t . = 10 m/s² (d) F = m•a . = 50kg x 10m/s² . = 500 kg m/s² . = 500N .