A rock with a mass of 25 kg is pushed up a 15 meter hill in 62 seconds. How much Power is needed to move the rock?

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

In a system, when potential energy decreases, then entropy also decreases. true false

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you