Kinetic energy and momentum

1. Nov 17, 2012

Lolagoeslala

1. The problem statement, all variables and given/known data
A car (of constant mass) doubles its kinetic energy while driving down a hill sloped at 45º. The factor by which its momentum changes is answer is 1.4?

2. Nov 17, 2012

Staff: Mentor

Yes. The factor is √2 ≈ 1.41

3. Nov 17, 2012

Lolagoeslala

Would u get how u got that?

1/2mv^2 = P right?

4. Nov 17, 2012

Staff: Mentor

$${KE}_1 = 1/2 m v^2_1$$
$${KE}_2 = 2 {KE}_1$$
Find v2 in terms of v1.