8. Which element will form a 2-ion?
sulfur
Calcium
potassium
helium

Explain what will happen if decomposers were apsent from a forest ecoysystem.

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?

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?