A stone is projected from ground level at 86 m/s. Its speed when it reaches its highest
point is 46 m/s. Find the angle of its projection.
1
Expert's answer
2010-09-28T01:55:48-0400
Let V0x, V0y be projections. At the highest point V0y=0, V0x=46 m/s - is constant. V0x=V0*cos(a). 46=86*cos(a); cos(a)=0.53; a=arcos(0.53)=57.67 Answer: the angle is 57.67
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