Which statement(s) correctly compare the masses of protons, neutrons, and electrons? check all that apply. protons and neutrons have similar mass. protons and electrons have similar mass. neutrons and electrons have similar mass. protons are smaller than a neutron or an electron. neutrons are smaller than a proton or an electron. electrons are smaller than a proton or a neutron.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s. when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?