A 1200kg car is moving on the freeway at 45.0mph .
1.What is the magnitude of its momentum in SI units?
2.What is the magnitude of its kinetic energy in SI units?
3.If a 2400kg SUV has the same speed as the 1200kg car, how much momentum does it have?
4.If a 2400kg SUV has the same speed as the 1200 kg car, how much kinetic energy does it have?

Question

A 1200kg car is moving on the freeway at 45.0mph .
1.What is the magnitude of its momentum in SI units?
2.What is the magnitude of its kinetic energy in SI units?
3.If a 2400kg SUV has the same speed as the 1200kg car, how much momentum does it have?
4.If a 2400kg SUV has the same speed as the 1200 kg car, how much kinetic energy does it have?

anonymous · Answer

i got the first part P=mv, converted the units from miles/hr to meters/s...:)

anonymous · Answer

Kinetic energy is given by $K=\frac{1}{2}mv^2$.  Both are proportional to mass (so if you double the mass, you double the momentum and energy).

anonymous · Answer

thank you I got all the answers right thanks!