physics
posted by hy .
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 64.7¡ã above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 25.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its engines shut down and the rocket coasts. By how much does the rocket clear the top of the wall?

physics 
bobpursley
Horizontal
distance=horzvelocity*time
time= distance/velocity= 25/(75cos64.7)
figure time, then put it here.
Vertical:
h=75*sin64.7t4.9t^2
how much higher is h than 11 m. 
physics 
hy
thanks

physics 
liz
where does the 4.9 come from?

physics 
tom
h=49.62m
49.62m11m for the wall
clear of the top = 38.62
4.9 its from multiplying 1/2(9.8m/s^2)
1/2(ay)
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