Niagara Falls is 51 meters high. If you dropped a ball off the ledge, how much time would it take it to hit the water? PLEASE SHOW WORK. WILL MARK BRAINLIEST

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block