A ball of mass 0.40 kg travels horizontally and strikes a vertical wall with a speed of 5.0 ms–1. It rebounds horizontally with a speed of 3.0 ms–1. The ball is in contact with the wall for a time of 0.20 s. What is the average magnitude of the force exerted by the ball on the wall?

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by