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Old 02-02-2013, 08:36 PM   #42
Fintft
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Quote:
Originally Posted by NLBwell View Post
1 m/s is at most a drop shot hit from close to the net. Yes, the racket will go backwards in that case as you take the speed off the ball.
True and I've done a fallacy there, I wasn't comparing the same balls (one was 60g while the other was 20g) so the correct comparison (with 60g balls in both cases), seems to give (for a 1 m/s swing aka drop shot):

Example A:
Ball: mass = 0.06 kg , velocity = 30 m/s
Racket: mass = 0.5 kg, velocity = -1 m/s

After collision:
Ball: velocity = -25.35 m/s (you are hitting slower then the incoming ball)
Racket: velocity =5.6 m/s (your arm is pushed back)
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Example B:
Ball: mass = 0.06 kg , velocity = 30 m/s
Racket: mass = 0.6 kg, velocity = -1 m/s

After collision:
Ball: velocity = -26.36 m/s (you are hitting just 4% faster)
Racket: velocity = 4.6 m/s (your raquet is 22% more stable)

That means that at slow swings (aka drop shots), one just gets stability out of heavier raquets…No surprise there
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