How are low-mass red giant stars important to our existence?

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Which inventor was often called the lady edison