A ball is thrown off a cliff with a horizontal velocity of 12. If the cliff is 51 meters tall, how many seconds will it take the ball to reach the ground? Please help ASAP

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 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Which notation is used to represent an alpha particle? a. b. c. d.