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1. What is the kinetic energy in joules of a 950-lb motorcycle moving at 50 mph ?

2. If the speed of the motorcycle changes from 50 mph (with kintic energy K1) to 25 mph (with kinetic energy K2), what is the ratio of K1 to K2?

2. Homework Equations

KE=1/2mv2

3. The Attempt at a Solution

1. 1.1×10 5 J

2. k1/k2= 0.25