When dropped from the same height, will a minivan or tricycle hit the ground first? Why?

Minivan hits the ground first than tricycle due to heavier mass and lesser air resistance.

Explanation:

According to Galileo's motion of objects, when two objects having different masses and areas dropped from same height does not hit the ground at the same time.

it's because the air offers much greater resistance to the falling motion of the lighter object than it does to the heavier one. The air is actually an upward force of friction, acting against gravity and slowing down the rate at which the tricycle falls.

Due to this when a minivan or tricycle when dropped from same height hits the ground at different times. As friction of air offers greater resistance to tricycle. Since minivan is heavier there will be lesser impact of air on it. So, minivan hits the ground first than tricycle.

c)as speed changes, wavelength and frequency change.

everything changes!

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.