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```        A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s.
(a) what will the ball\'s speed be when it returns to its starting point?
(b) how long will the ball take to reach its starting point?```
7 years ago

510 Points
```										ans a) speed of ball will be equal to the speed of projection....
ans b)  applying v = u +at
at the topmost point v=0
t=u/a =8/10 sec                   (  accleration a =-g)
t is the time taken by the ball to move to highest point
so total time of flight is 2t
T=16/10 =8/5 sec
```
7 years ago
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