Posted by **Sarah** on Monday, June 22, 2009 at 2:06pm.

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?

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**bobpursley**, Monday, June 22, 2009 at 2:29pm
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

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**Sarah**, Monday, June 22, 2009 at 2:45pm
so the answer would be 29.05 m/s for a

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**bobpursley**, Monday, June 22, 2009 at 4:31pm
No. That is the velocity. Now compute momentum, and KE.

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**Camille**, Sunday, November 11, 2012 at 2:13pm
300 000 = (1/2)M x 20^2 so M = 1 500kg

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