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27 Nov 2019

A rock is thrown from the top edge of a 100-ft tall building at some unknown angle above the horizontal. The rock strikes the ground a horizontal distance of 160 ft from the base of the building 5.0 s after being thrown. Assume that the ground is level and that the side of the building is vertical. Determine the speed with which the rock was thrown. [Hint: Choose an origin of coordinates and decide which directions are positive. Use a constant-acceleration equation for the x and y directions separately. Solve them to find the components of the initial velocity and hence the speed. You do not need to solve for the angle (although you can).]

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Elin Hessel
Elin HesselLv2
27 Jul 2019

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