A freight car in a park moves along a frictionless level railroad track at constant speed. The freight car is open on top. A kid who was hanging on a branch of a tree that is over the track. As soon as the car passes under the branch, the kid let go of the branch and landed on the car. What happens to the speed of the freight car? Group of answer choices

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.