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?

Answer 1

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

Answer 2

so the answer would be 29.05 m/s for a

Answer 3

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

Answer 4

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