Any help would be greatly appreciated! A student standing on the ground throws a

Question

Any help would be greatly appreciated! A student standing on the ground throws a ball straight up.The ball leaves the student's hand with a speed of 14 m/s when the hand is 1.7 m above the ground. How long is the ball inthe air before it hits the ground? (The student moves her hand outof the way.)

_____s A hotel elevator ascends 210 mwith a maximum speed of 5.0 m/s. Itsacceleration and deceleration both have a magnitude of 1.0m/s2. (a) How far does the elevator move whileaccelerating to full speed from rest? _____m (b) How long does it take to make the complete trip frombottom to top? _____s Any help would be greatly appreciated! A student standing on the ground throws a ball straight up.The ball leaves the student's hand with a speed of 14 m/s when the hand is 1.7 m above the ground. How long is the ball inthe air before it hits the ground? (The student moves her hand outof the way.)

_____s A hotel elevator ascends 210 mwith a maximum speed of 5.0 m/s. Itsacceleration and deceleration both have a magnitude of 1.0m/s2. (a) How far does the elevator move whileaccelerating to full speed from rest? (a) How far does the elevator move whileaccelerating to full speed from rest? _____m (b) How long does it take to make the complete trip frombottom to top? _____s

Explanation / Answer

Given :

a ) Initial velocity ( u ) = 14 m/s

final velocity ( v ) = 0

g = 9.8 m/s2

Initial Height ( hi ) = 1.7 m

v2= u2 + 2 g ( hf -hi )

   hf = 1.7 + 196 / 19.6

      = ---- m

   time ( t1 ) = 2 hf / g

                    = ------s

      time ( t2 ) =2( h f + hi )/ g

                    = ----- s

     Solve it                                   

  I hope it helps you

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