# Energy question

1. Mar 1, 2013

### Jabababa

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

A 3.0 kg object travels vertically at a constant speed of 2.0m/s. What is the increase in gravitational potential energy after 4.0 sec?

2. Relevant equations

Ep=Mgh

3. The attempt at a solution

I know i need to find the height but, with constant velocity i dont know how to plug into any kinematic equations to find the height.

The answer is 2.4 x 10^2 J.

2. Mar 1, 2013

### sandy.bridge

A change in gravitational potential energy results from a change in height. You can find that change in height using kinematics equations.

3. Mar 1, 2013

### Jabababa

Yes, i know that part...but i have no idea how to plug into the kinematic equations with a constant velocity. All the equations are involved with a initial velocity and a final velocity.

4. Mar 1, 2013

### voko

At constant speed v, what is the distance covered during some time t?

5. Mar 1, 2013

### Jabababa

omg thanks!! I totally forgot the most basic one, V= d/t!!