Problem Statement: 4*10^5 Joules of work is required to reduce a car's velocity from 30m/s to 15m/s. What is the car's mass?
Relevant equations: Ke=.5*m*v^2
The attempt at a solution:
V1 = 30m/s
V2 = 15m/s
M = mass of car
.5*M*V1^2 - 4*10^5J = .5*M*V2^2
450M - 4*10^5J = 112.5M
-4*10^2 =...