Homework Help: physics

Posted by rhea on Saturday, November 24, 2012 at 6:01am.

a projectile shot at an angle of 60 degrees above the horizontal strikes a building 80 ft away at a point 48 ft above the point of projection (a) find the velocity of projection. (b) find the magnitude and direction of the velocity of the projectile when it strikes the building.

please help me,,,
thanks you

physics - drwls, Saturday, November 24, 2012 at 7:01am
(a) Write two independent equations for the time of flight T, based upon (1) the initial vertical component and (2) the horizontal component of initial velocity, Vo. Set the two times equal to eliminate T, and then solve for Vo

(b) Vx = Vo cos60
Vy (at impact) = Vo*sin60 -g*T

Fot T, use 80 ft/(Vo*cos60)
physics - rhea, Sunday, November 25, 2012 at 4:30am
thank you so much ^^

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