A stone is dropped from a height of 7.70m. How fast is it going when it reaches the ground?

Question

anonymous · Answer

Same thing. The potential energy at top will be equal to kinetic energy at bottom.

anonymous · Answer

i think i got it... im not sure though

anonymous · Answer

It doesn't give us a mass or velocity

anonymous · Answer

velocity you have to calculate.. 
mgh = 1/2 mv^2
v = sqrt(2gh)
See the velocity is independent of mass :)

anonymous · Answer

i got 12.2849501423 and it was correct! thank you so much :)
btw im a girl

anonymous · Answer

Oh, Girl you are sorry :D

anonymous · Answer

wanna help me again?

anonymous · Answer

ok

anonymous · Answer

A 1600 kg car on a flat ground is moving 6.25 m/s. Its engine creates a 1150N forward force as the car moves 45.8m. What is its final KE?