A locomotive pulls a train at a velocity of 88.0 km/hr with a force of 55,000N. what power is excented by the locomotive?

Ineed the answers for these promblems i have

What is a carrier wave and how does it affect what you hear on the radio

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?