Calculate Vertical Velocity of 50kg Diver from 15m Board

[bionut]

(Q) If a diver (standing on a 15 meter high diving board) dives horizontally from the board, and mass is 50 kg. What is his vertical velocity 10 meters from the board ?

PE @ 15m = mgh = 7358j (max)

PE @ 10m = mgh = 4905j

KE @ 10m = 7358 - 4905 = 2453j

KE = 1/2 mv(sqr)

2453= 0.5 x 50 kg v(sqr)

v= 9.91 m/s ... but this is wrong and I can't think of what I have done wrong... any ideas...

 

[cepheid]

It's 10 metres from the board, not 10 metres above the water. So your second height is just wrong.

 

[bionut]

Ohhh thankyou... lol... (always read the question twice and double check you understand it lol)...