Asked by bec
a boy stands on a cliff overlooking a lake below. He throws a rock at an initial velocity of 8.0m/s,at an angle 25 degrees above the horizontal. The lake's surface is 4.5 m lower than the point the rock was released. Find the speed of the rock just before it hits the surface of the water. Ignore air friction.
Answers
Answered by
bobpursley
final KE= Initial KE+ initial PE
1/2 mvf^2=1/2m(8)^2 + m*9.8*4.5
solve for Vf
1/2 mvf^2=1/2m(8)^2 + m*9.8*4.5
solve for Vf
Answered by
bec
can i do this with out m?
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