NEET Class neet Answered
explain
Asked by adititiwari601 | 30 Jun, 2022, 08:08: AM
Expert Answer
Let v be the initial projection velocity of the ball from the truck that is moving with speed 14.7 m/s
Time taken τ by the ball to reach the truck after travelling up vertcally and then travelling downwards is given as
τ = 2 × ( v / g )
where g is acceleration due to gravity
It is given that ball reaches the same truck after 4 s
hence , 2 × ( v / g ) = 4 or v = 2 × 9.8 m/s = 19.6 m/s
hence initial projection velocity of ball as observed by observer on road =
Angle of projection as observed by observer on road = tan-1(19.6/14.7) = 53o with horizontal
Answered by Thiyagarajan K | 30 Jun, 2022, 12:47: PM
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