Question

A girl and her dog are running away from their house. The dog has a mass of 20kg. The girl has a mass of 60 kg.

Suppose the dog sees a cat and speeds up and is now running away from home at a velocity of 4m/s What is the kinetic energy of the dog?

Answer 1

Answer: 160 joules

Explanation: the formula for kinetic energy is KE= 1/2 x m x v squared (ke being kinetic energy, m being mass of the object and v being velocity). To find the kinetic energy, you must plug in the given values. KE= 1/2 x 20 x 4 squared. 4 squared is 16, 16 times 20 is 320 and 1/2 of that is 160- so that’s your answer.