Posted by shaknocka on .
It takes 214 kJ of work to accelerate a car from 23.1 m/s to 29.3 m/s. What is the car's mass?

physics 
drwls,
Solve the equation
(M/2)(V2^2  V1^2) = 214,000 J
to obtain M. You know what the two velocities are (V1 and V2).
M will be in kg if V is in m/s.