A 5.0kg kid comes down a slide from a height of 3.0 meters. At the bottom, he has a speed of 6.3m/s. The slide is 5.0 meters long. What is the frictional force acting on the kid

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Positrons are spontaneously emitted from the nuclei of