AP EAMCET202423 May 2024Morning ShiftPhysicsMotion in Two DimensionsActual
A diving board is at a height of ' h ' from the water surface, A swimmer standing on this board thrown a stone vertically upward with a velocity 16 ~ms ⁻¹ . It reaches the water surface in a time of 5 s . In the next 0.2 s , the diver can hear the sound from water surface. The speed of sound is (acceleration due to gravity g =10 ~ms ⁻² )
Options
- A450 ~ms ⁻¹
- B225 ~ms ⁻¹
- C200 ~ms ⁻¹
- D275 ~ms ⁻¹
Correct answer
B. 225 ~ms ⁻¹
Step-by-step solution
aligned & u =16 ~ms ⁻¹, t ₁=5 s & ~h =- ut ₁+ 1 2 gt ₁^2=-16 5+ 1 2 10 5 5=45 ~m aligned Now, d = v t ₂ 45= v 0.2 v =225 ~ms ⁻¹