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A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 15m/s when the hand is 2.0m above the ground.

How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.) Express your answer using two significant figures.

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Added Wed, 11 Nov '15
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s= (v^2- u^2)/2a

s= -225/-19.6= 11.47 m

total s= 13.47 m

s= ut +1/2 at^2

13.47= 1/2*9.8t^2

t=1.66 sec time taken during fall

time taken going up= t1

v= u+at1

0= 15-9.8t1

t1=1.53 secs

total time taken= t+t1= 3.19 secs

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Added Wed, 11 Nov '15
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