Question

A ball with a volume of 3 cm3 and a density of 9.0 g/cm3 increases its velocity from 2 m/s to 6 m/s over a 12

second period of time. What force was applied to get it moving?

Answer 1

M = ρ V = 9 gm/cm^ 3 * cm^3 = 27 gm

a = (V2 - V1) / t = (6 - 2) m/s / 12 s = 1/3 m/s^2 the acceleration

F = M a = 27 gm * 1/3 m/s^2 = 9 dynes net force applied