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A ball is thrown vertically upwards. It goes toa height 20 m and then returns to theground. Taking acceleration due to gravity g tobe 10 m s2, find :(a) the inital velocity of the ball(b) the final velocity of the ball on reachingthe ground and(c) the total time of journey of the ball. |
Answer» A) The initial velocity of the ball is 20m/s :As it reaches a maximum height of 20mand 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/sAs the velocity of any object thrown upward with some speed lands on the ground with the sane speed c) use v=u+at0=20-10t »t=2 secbut this is the time it reach the max. heightso it will take 2 more sec to reach ground» Time = 4 sec |
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