Homework Help: physics

Posted by bec on Monday, November 7, 2011 at 8:23pm.

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.

physics - bobpursley, Monday, November 7, 2011 at 8:28pm
final KE= Initial KE+ initial PE
1/2 mvf^2=1/2m(8)^2 + m*9.8*4.5

solve for Vf
physics - bec, Monday, November 7, 2011 at 9:00pm
can i do this with out m?

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