How long does it take an acorn to hit the ground after dropping from the branch of a tree 12.5 m high? remember that g=9.8 m/s^2!

1.0 s, 5.0 s, 2.6 s, or 1.6 s

**not sure about : (

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation 2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!