Acannon on a railroad car is facing in a direction parallel to the tracks. it fires a 98.0-kg shell at a speed of 215 m/s (relative to the ground) at an angle of 60.0° above the horizontal. if the cannon plus car have a mass of 5.00 × 104 kg, what is the recoil speed of the car (relative to the ground) if it was at rest before the cannon was fired? express your answer in m/s.

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?