Question

Find the kinetic energy of the objects in the scenarios.

A. A cosmic pion of mass 140 MeV/c2140 MeV/c2 flies through outer space at a speed of 9.47×103 km/s9.47×103 km/s. See the hint for help converting MeV/c2MeV/c2 to kg.

K=K=

JJ

B. A cheetah weighing 6.20×102 N6.20×102 N chases a gazelle at a speed of 30.1 m/s30.1 m/s.

K=K=

JJ

C. A truck weighing 2.24 short tons2.24 short tons speeds down the road at 66.6 mph66.6 mph.

K=K=

JJ

D. An asteroid of mass 2.71×1017 kg2.71×1017 kg buzzes the Earth at a speed of 15100 mph15100 mph.

K=K=

J

Answer 1