A Pendulum, swinging back and forth, rises at the end of its swing to a position 15 cm higher than its lowest point. How fast is it going at the lowest point

It is really hard for me right know

What is the relationship between the direction of motion of the balloon and the wind currents

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.