# Homework Help: Power problem Help!

1. Oct 7, 2012

### layla2525

1. The problem statement, all variables and given/known data

I push two frictionless carts along a table, using a force of 10 N on each. Riding on one cart is a squid and on the other cart is a mango. They have the same mass. The squid's cart is moving at 2.0 m/s when I start pushing, in the same direction that I push. The mango's cart, on the other hand, starts from rest. Compare the power that I am delivering to each cart.

Which of the following is correct?

I am delivering more power to the cart with the squid.

I am delivering more power to the cart with the mango.

I am delivering the same power to both since the force is the same.

2. Relevant equations

P=F(V)

3. The attempt at a solution

I can substitute ma for force and V0 +(1/2)a(t) for V. But i have two unknows a and P.
Am I applying more power to the cart with the squid because the initial velocity 2.0 ?

2. Oct 7, 2012

### voko

Since P = FV, and F is the same, the question boils down to the comparison of the velocities. Can you say which one is greater? Is it always greater? Why?

3. Oct 7, 2012

### layla2525

I need the acceleration to solve for the velocity...

4. Oct 7, 2012

### voko

You have the force. Surely you can obtain acceleration.

5. Oct 7, 2012

### layla2525

can i use 9.8 for acceleration? in that case squid has a greater velocity since it started at 2.0

6. Oct 7, 2012

### voko

Why 9.8? Why not 370913.2?

7. Oct 7, 2012

### layla2525

Where are getting that number from?