A father lifts a toddler 1.5m up in the air. The child gains 187.5J of gravitational potential energy as a result. What is the mass of the toddler? (Assume that the gravitational field strength is 10N/kg.)

Mass of toddler = 12.5 kg

Explanation:

The potential energy of a body is given by the expression, PE = mgh, where m is the mass of the body, g is the acceleration due to gravity value and h is the height of the body.

Potential energy = 187.5 J

Height = 1.5 m

Substituting

187.5 = m * 10 * 1.5

m = 12.5 kg

So mass of toddler = 12.5 kg