1. What is the kinetic energy of a 0.5 kg marble rolling down at a speed of 0.8 m/s? 2. A train is moving at a speed of 0.8 mi/min. If the mass of the train is 800,000 g, how much is its kinetic energy?Please answer with complete solutions hehe Thank you so much. God bless you.
Answer (1)
1. KE = 1/2 (0.5kg) × (0.8m/s)² KE = 0.25 × 0.64 = 0.16 J2. 800,000 = 800kg 0.8 mi/min = 21.46 m/s KE = 1/2 (800) × (21.46)² KE = 400 × 460.54 ≈ 184,256 J
