1. A spring gun initially compressed 2 cm fires a 0.01 kg dart straight up into the air. If the dart reaches a height of 5.5 m, determine the spring constant of the dart gun. PLEASE HELP!

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.