How Do You Calculate Time from Energy and Power?

[melleyb]

Question:

A 5 kg ball is tossed into the air with an initial velocity of 6 m/s. I f the power delivered to the ball was 100 watts, over what time inteval did the power delivery occur?

my answer = 178m/s/s ?

oh bugger!

 

[radou]

First of all, if you're asked for a time interval, then your answer cannot contain acceleration units, i.e. [m/s^2].

 

[rsk]

What's the energy delivered to the ball?

How do you find time when you know energy and power?