A car with mass 50kg falls freely from rest through a height of 100m and come to rest having penetrated 5.0cm into the ground A calculate the time taken to fall B calculate the velocity when the body strikes the ground

Could someone . i have tried to solve myself but my calculation is off

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Explain what happens at the saturation point when adding salt to water at room temperature.