Question (I added a picture): The free-rolling ramp has a mass of 40 kg. A 10 kg crate is released from rest at A and slides down 3.5 m to point B. If the surface of the ramp is smooth, determine the ramp's speed when the crate reaches B. Also, what is the velocity of the crate?(adsbygoogle = window.adsbygoogle || []).push({});

This is what I did for finding the velocity of the ramp:

1) \sigma mv1 = \sigma mv2

2) mass ramp * (velocity ramp)1 + mass crate * (velocity crate)1 = mass ramp * (velocity ramp)2 + mass crate *(velocity crate)2

3) 40*Vr + 0 = 40*Vr2 + 10*Vc2

Too many unknowns?

This is what I did for finding the velocity of the crate:

1) Vc2^2 = Vinitial^2 + 2*a*(S-Sinitial)

= 0 + 2 * 4.905 * 3.5

Vc2 = 5.86 m/s

2) I can substitute this in to the first equation, but I still have too many unknowns. What should I do next?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Impulse and Momentum of a crate

**Physics Forums | Science Articles, Homework Help, Discussion**