Homework Help: Physics

Posted by Jen on Monday, June 11, 2012 at 3:14pm.

A block of mass 77.0kg is placed at the top of a frictionless plane that is inclined 46 degrees to the horizontal. The height of the plane is 23.0 meters. Find the speed of the block at the bottom of the plane.

Please show all your steps, don't just suggest a formula.

Thank you so much.

Physics - Elena, Monday, June 11, 2012 at 3:32pm
PE -> KE,
PE=KE,
KE=m•v²/2,
PE=m•g•h,
m•g•h =m•v²/2,
v=sqrt(2 g•h).

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