How fast will he be moving backward just after releasing

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Q. An 80- quarterback jumps straight up in the air right before throwing a 0.430- football horizontally at 15. How fast will he be moving backward just after releasing the ball? How fast, will the quarterback be moving backward just after releasing the ball?

Q. Under favourable circumstances the human eye can detect 1.0e-18 J of electromagnetic energy. How many 600-nm photons does this represent?

 

Reference no: EM1392601

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