A rock is thrown horizontally off a 30-m high cliff at 15 m/s. a. How long does it take this rock to reach the ground?
b. How far away from the bottom of the cliff, horizontally, does the rock hit the ground?

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?