Homework Help: Physics

Posted by Julia on Tuesday, November 1, 2011 at 4:29pm.

A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of gravity is 9.8 m/s^2.(squared) Assume: The ground is level and that the side of the building is vertical. Neglect air friction. What is the vertical component of the rock's velocity when it strikes the ground? Answer in units of m/s

Physics - Henry, Thursday, November 3, 2011 at 9:24pm
Vo = 19.6m/s @ 31deg.
Xo = hor. = 19.6cos31 = 16.80m/s.
Yo = ver. = 19.6sin31 = 10.1m/s.

Dh = Xo*T = Hor. dist.
T = Dh / Xo = 77 / 16.8 = 4.58s = Time
in flight.

t(up) = (Yf - Yo) / g,
t(up) = (0 - 10.1) / -9.8 = 1.03s.

t(dn) = T - t(up) = 4.58 - 1.06=3.55s.

Yf = Yo + gt,
Yf = 0 + 9.8*3.55 = 34.8m/s. = Ver.
component of final velocity.

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