Energy Stores & Transfers — Exam Questions

Calculate the kinetic energy of a 0.5 kg ball moving at 4 m/s.

A light bulb has an input power of 60 W and produces 15 W of useful light energy. Calculate its efficiency.

A 2 kg object is dropped from a height of 10 m (g = 10 m/s²). Using conservation of energy, calculate its speed just before hitting the ground.