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AP EAMCET202018 Sep 2020Evening ShiftPhysicsMotion in One DimensionActual

When a player thrown a ball, it reaches the other player in (4 ~s ). If the height of each player is (1.8 ~m ), the maximum height attained by the ball above the ground is

Options

  1. A(19.4 ~m )
  2. B(20.4 ~m )
  3. C(21.4 ~m )
  4. D(22.4 ~m )

Correct answer

C. (21.4 ~m )

Step-by-step solution

Time taken to reach the ball from one player to another is equal to time of flight. Hence, time of flight, (T=4 ~s ) ( 2 u g =4 u =2 g ) ...(i) Height attained by the ball above the ground (= ) height of either player + maximum height ( aligned & =1.8+ u^2 ^2 2 g =1.8+ (u )^2 2 g =1.8+ (2 g)^2 2 g & =1.8+2 g=1.8+2 9.8=1.8+19.6=21.4 ~m aligned )

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