Posted by **A** on Sunday, October 17, 2010 at 5:30pm.

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 50.0 kg, the sled has a mass of 5.00 kg and her brother has a mass of 30.0 kg.

- Physics -
**bobpursley**, Sunday, October 17, 2010 at 5:34pm
1. figure with conservation of momentum the initial velocity of gayle/sled

2. Now, with conservation of energy, the speed at bottome of hill.

KEbottom=KEattop+PEtop

1/2(Mg+ms)vbottom^2=1/2(Mg+ms)Vtop^2 + (Mg+Ms)g*height

figure vbottom.

Now, with conservation of momentum, figure the new velocity with brother on back.

Then, at the bottom of the hill, figure new velocity with conservation of energy, as before on the first hill.

## Answer this Question

## Related Questions

- physics - Gayle runs at a speed of 8.00 m/s and dives on a sled, initially at ...
- Physics URGENT!!! - Gayle runs at a speed of 9.00 m/s and dives on a sled, ...
- Physics URGENT!!! - Gayle runs at a speed of 9.00 m/s and dives on a sled, ...
- Physics URGENT!!! - Gayle runs at a speed of 9.00 m/s and dives on a sled, ...
- physics - Josh starts his sled at the top of a 2.0 m-high hill that has a ...
- physics - a sled slides down a frictionless hill. if the sled starts from rest ...
- physics - You are pulling your sister on a sled to the top of a 20.0 m high, ...
- physics - a child holds a sled at rest on a frictionless snow covered hill. if ...
- Pyhsics - A sled slides down a snow-covered hill at CONSTANT SPEED. If the hill ...
- Physics - A child insists on going sledding on a barely snow-covered hill. The ...

More Related Questions