A baseball is thrown into the air. It has an upward vertical velocity of 10m/s and an initial rightward horizontal velocity of 15m/s. Define upward vertical and rightward horizontal as positive directions. What is the resultant velocity (magnitude and direction relative to the rightward horizontal)?

Can someone explain to me how to do this problem ?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp