Question

A rolling ball has 18 joules of kinetic energy and is rolling 3 m/s. Find its mass.

Answer 1

Explanation:

Given: Kinetic energy K.E = 18 J; 

          Velocity = 3 m/s

Formula: K.E = 1/2 mV²

              m = 2 K.E/V²

              m = 2(18 Kg.m²/s²)/(3 m/s)²

              m = 36 Kg.m²/s²/9 m²/s²

              m = 4 Kg