URGENT i dont understand how to do this can someone help me A 0.35 kg ball is dropped to the floor, and is in contact with the floor for 0.60 seconds.

a.) If the ball is dropped from a height of 1.2 m, what is the velocity of the ball right before it hits the ground?

b.) What is the force of the ball on the ground?

c.) What is the force of the ground on the ball?

d.) What is the change in momentum from the point when the ball is dropped until it hits the floor?

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3