# Amount of force a motor can make in 35s

1. Feb 16, 2015

### PsychoSya

1. The problem statement, all variables and given/known data
An electric motor develops 65kW of power as it lifts a loaded elevator 17.5 m in 35s. How much force does the motor exert?
Acceleration: .5
2. Relevant equations
F equals mass times acceleration

3. The attempt at a solution
Ok so I tried to find mass but when the equation was m equals N divided m/s(squared) but there isn't a weight there. Also I tried the force equation but I can't do that without mass...

2. Feb 16, 2015

### SteamKing

Staff Emeritus
Power is measured in units of watts, which is a derived unit in the SI system. You are given a distance traveled by the elevator and a time in which to do this, which suggests a certain velocity for the elevator. Is there a formula for power which you can derive that uses force and velocity. Hint: look at the units of each quantity.

3. Feb 17, 2015

### haruspex

Don't be put off by such matters. Just invent an unknown m for the mass and see if you can get enough equations to eliminate it later.