Physics homework question, not sure if the answer is right?

S

sunshine.

New member
George was mowing his front lawn, and he pushed the mower 800m. It took him 10 minutes to complete. The mower has a mass of 25 kg.
How much kinetic energy did the mover have as George mowed his lawns?
I got 24.5 J but is it right?
Help!
 
Let the mower was at rest initially=>u=0,
=>s = ut + 1/2at^2
=>800 = 0 x t + 1/2 x a x (10x60)^2
=>a = (800 x 2)/(10 x 10 x 60 x 60)
=>a = 4.4 x 10^-3 m/s^2
=>F = m x a
=>F = 25 x 4.4 x 10^-3 = 0.11 N
Total Energy = Total Work = F x s = 0.11 x 800 = 88 J
 


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