WILL NAME BRAINLIEST!! NEED HELP A person drops a small rock from a height of 5.2 meters. How long will it take that rock to hit the ground if it is dropped on earth? Assume the acceleration due to gravity is 10 m/s/s.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

Need only answer if you think you know it

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton