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nice4life
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Homework Statement
You are on the top of a 100m high (approximately 30 story) building. You just finished building a brick grill so the tenants of the building can have barbecues. You have one brick left and do not want have to lug it back off the roof. Luckily, you see a garbage truck with its roof open (top of trash pile is 2m above the road) coming down a road that passes by the building. The road is 30m from the building at closest approach. The truck is moving down the road with constant velocity 15m/s. You need to make sure you hit the trashpile, or someone is going to get hurt. You can throw the brick comfortably at an angle of 45◦ above the horizontal.
(a) What velocity do you need to throw the brick so that it hits the top of the trash pile
when the truck is 30m away from the building? Does this sound like you could do it?
Homework Equations
deltax=Vox*t+1/2at^2 Vox = Initial velocity on x dimension.
Vy = Voysin0
Vx = Voxcos0
The Attempt at a Solution
I understand that I need Voysin0 and Voxcos0, but don't have Vo for x or y.
delta x = 30m and i think deltay = 98m because the truck is 2m about ground from the 100m building.
since on x axis/dimension accel. is constant 0. deltaX=Vox*t+0 but i don't know Vox.
Because they did not give me an initial velocity I am finding it very difficult to get this started. How do I find the Vsin0 and Vcos0 without relevant velocities?
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