A level physics mechanics questionWatch
The end of the ramp is 1.8 m above the water surface. The kite boarder leaves the ramp at a velocity of 12 m s−1 and at an angle of 17° to the horizontal. The kite boarder lets go of the line at the instant he leaves the ramp.
Calculate the speed with which the kite boarder enters the water.
Assume that the kite boarder is a point mass and ignore the effects of air resistance
Why is this 13.4 and not 6.9?
The mistake you've made is that the question asks for speed, not vertical velocity - you still have to include the horizontal component of the velocity, which is unchanged.