A ball is thrown vertically upwards. It goes to a height 20m and then

1.	A ball is thrown vertically upwards. It goes to a height 20m and then returns to the ground. Taking acceleration due to gravity g to be 10m/s^2, find:1) the initial velocity of the ball. 2) the final velocity of the ball on reaching the ground 3) the total time of journey of the ball [ show me the process please. answers given 1) 20m/s 2) 20m/s 3) 4s]
Answer» Answer: a) The initial velocity of the ball is 20m/s : As it REACHES a maximum height of 20m and the acceleration is 10m/s^2. So in order to reach a height of 20m ,with an acc. in opp. DIRECTION it has to move with 20m/s b) 20m/s As the velocity of any OBJECT thrown upward with some speed LANDS on the GROUND with the sane speed c) use v=u+at 0=20-10t »t=2 sec but this is the time it reach the max. height so it will take 2 more sec to reach ground » Time = 4 sec hope...it...helps..

A ball is thrown vertically upwards. It goes to a height 20m and then returns to the ground. Taking acceleration due to gravity g to be 10m/s^2, find:1) the initial velocity of the ball. 2) the final velocity of the ball on reaching the ground 3) the total time of journey of the ball [ show me the process please. answers given 1) 20m/s 2) 20m/s 3) 4s]

Answer»

Answer:

a) The initial velocity of the ball is 20m/s :

As it REACHES a maximum height of 20m

and the acceleration is 10m/s^2.

So in order to reach a height of 20m ,with an acc. in opp. DIRECTION it has to move with 20m/s

b) 20m/s

As the velocity of any OBJECT thrown upward with some speed LANDS on the GROUND with the sane speed

c) use v=u+at

0=20-10t

»t=2 sec

but this is the time it reach the max. height

so it will take 2 more sec to reach ground

» Time = 4 sec

hope...it...helps..

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