# HELP! Simple Work Problem!

1. Mar 19, 2009

### Rha1828

Sam works at an amusement park. A boat of children on a water ride comes the the pier at the end of the ride. They are moving at a constant speed of 1.2 m/s, and the loaded boat has a mass of 1200kg. Sam slows the boat down by pushing on it until it comes to rest at the pier. If he stops it in a distance of 1.75m, and his arms make a 30o angle above the horizontal,

* a) how much work did Sam do on the boat?
* b) how large a force did he apply to the boat?

I thought if I added the mass X gravity that would five me force.
Then I took F cos theta X s to get 1.51 J
and the foce would be 11760.

I am not sure if that is right.

Please any help would be great!!

2. Mar 19, 2009

### sArGe99

First find out the acceleration of the boat using kinematic data given...and calculate the force applied by Sam.

3. Mar 19, 2009

### Rha1828

I don't understand how you would solve for acceleration.

4. Mar 19, 2009

### tiny-tim

Hi Rha1828!

Just use one of the standard constant acceleration equations.

5. Mar 19, 2009