Physics
posted by Sarah on .
A 1200 kg car is moving on the freeway at 65 mph. (A) find the magnitude of its momentum and its kinetic energy in SI units. (b) if a 2400 kg SUV has the same speed asthe 1200 kg car, how much momentum and kinetic energy does it have?

on b), twice the mass means twice the momentum and twice the energy.
a) change 65mph to m/s. To check that, put this in your google search window:
65miles/hr in m/s 
so the answer would be 29.05 m/s for a

No. That is the velocity. Now compute momentum, and KE.

300 000 = (1/2)M x 20^2 so M = 1 500kg