Homework Help: physics

Posted by hy on Sunday, October 24, 2010 at 2:10pm.

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 64.7Ёу 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, Sunday, October 24, 2010 at 2:18pm
Horizontal
distance=horzvelocity*time
time= distance/velocity= 25/(75cos64.7)
figure time, then put it here.
Vertical:
h=75*sin64.7t-4.9t^2
how much higher is h than 11 m.
physics - hy, Sunday, October 24, 2010 at 2:33pm
thanks
physics - liz, Sunday, January 16, 2011 at 3:50pm
where does the 4.9 come from?
physics - tom, Wednesday, September 21, 2011 at 2:18am
h=49.62m
49.62m-11m 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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