Posted by Pat on Friday, February 26, 2010 at 9:30am.
Write down all the given then this problem might not be hard.
m of ball = 145 kg
t = 0.04 s
v = 50 m/s
Force(avg) = mass*acceleration(avg)
Also, acceleration(avg) = (delta)velocity/(delta)time, where delta represents change.
Now, solve for these variables:
acceleration(avg) = (50-0)/(.04-0) = 1250 m/s^2. Now calculate avg force:
Force(avg) = (.0145)(1250) = 18.125 N
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