A tennis player tosses a tennis ball straight up and then catches it after 2.21

Question

A tennis player tosses a tennis ball straight up and then catches it after 2.21 s at the same height as the point of release. (a) What is the acceleration of the ball while it is in flight? magnitude direction (b) What is the velocity of the ball when it reaches its maximum height? magnitude direction m/s (c) Find the initial velocity of the ball. m/s upward (d) Find the maximum height it reaches Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. On March 19, 1954, he down a track at a speed of 632 mi/h (see figure below). He and the sled were safely brought to rest in 1.40 s.

Explanation / Answer

a) 9.8m/s^2. ..... That is acceleration due to gravity.

Downwards

b)zero

c) T=2U/g

2.21=2U/9.8

U=2.21*4.9=10.829 m/s

d)H=U^2/2g=5.98m

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