A boy on Earth jumps straight upward with an initial velocity of 4.9 m/s. How long does it take for him to reach maximum height?

PLEASE

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

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