- #1
harujina
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Homework Statement
A golf club with 65 J of kinetic energy strikes a stationary golf ball with a mass of 46 g. The energy transfer is only 20% efficient. Calculate the initial speed of the golf ball.
Homework Equations
efficiency = E out/E in x 100%
The Attempt at a Solution
I found E in by: E in = E out/efficiency x 100% = 65 J/20 x 100% = 325 J
But how could I find initial speed?
I now have E out= 65 J, E in= 325 J, m= 46 g= 0.046 kg, and efficiency = 20%.
I'm confused as to how I should tackle most of these efficiency problems...