An object of mass 4.0 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s². How high did the object go?

Question

Quizplus · Accepted Answer

Using the conservation of energy, the initial kinetic energy is converted to gravitational potential energy at the highest point. The initial kinetic energy is (1/2)mv^2 = (1/2)(4)(20)^2 = 800 J. At the highest point, potential energy is mgh = 4 * 10 * h. Setting these equal gives 800 = 40h, so h = 20 m.

An Object of Mass 4