Question

A toy truck has a speed of 10 m/s and kinetic energy of 50 J. What is its mass?

A. 5 kg
B. 4 kg
C. 1 kg
D. 3 kg

Answer 1

Answer: 5kg

Explanation: formula K=1/2mv^2

50=10m

Answer 2

Answer:

C

Explanation:

KE = 1/2 m v^2

KE *2 / v^2   = m

50 (2)/ 10^2   = m =  1 kg