A heavy rock and a light rock are dropped from the same height and experience no significant air resistance as they fall. Which of the following statements about these rocks are correct? O The heavier rock reaches the ground before the lighter rock. O Both rocks have the same kinetic energy just before they reach the ground. O None of the given choices O Just as they were released, both rocks had the same amount of gravitational potential energy. Both rocks have the same speed when they reach the ground.

A 62.6 kg runner has a speed of 5.30 m/s at one instant during a long-distance event. HINT What is the runner's kinetic energy at this instant (in J)? J (b) How much net work (in J) is required to triple his speed? J

B1

The work required by Neymar to push a box of soccer balls on a horizontal, frictionless floor to accelerate it from a speed of zero to v is W1. The work required by Neymar to accelerate the box of soccer balls on the same floor, from v to 2v is W2. The ratio of W2 to W1 is   The correct answer is 3 but I don't know how they got to that answer

PRINTER VERSION 1 BACK NEX Z Your answer is partially correct. Try again. In the figure, a frictionless roller coaster car of mass m = 832 kg tops the first hill with speed vo = 19.0 m/s at height h = 44.0 m. What is the speed of the car at (a) point A, (b) point B, and (c) point C? (d) How high will the car go on the last hill, which is too high for it to cross? Use g=9.81 m/s2. First hill- B h/2 C (a) Number19 UnitsTm/s (b) Number28.15 UnitšT m/s (c) Number 35 Units m/s (d) Number" Units Click if you would like to Show Work for this question: gen/shared/assignment/test/aglist.uni?id3. Open Show Work earch 9:18 PM ENG 4/4/2021 13 ) is 16 17 .ロ/京 19home & 4 6. 7. 8. 9. 近

⦁ Envision yourself doing a jumping jack. Imagine you assume a standing X position, with your arms above your shoulders in a wide V and legs apart in an inverted V. When you hold that position, you are demonstrating ______ energy. When you do the jumping jack from the previous position you are converting that energy into _____ energy. ,

Your humble physics Professor elevates a ball hanging from a string away from it's lowest position and holds it there. It requires 105 J of Energy to do this. What is the balls change in PE ? 100 J O 105 J O Not enough information to answer this question O 50 J

if the gravitational potential energy is 120,000 J and the kinetic energy is 20,000 J at position A what is the total energy?

A bicycle and rider going 11 m/s approach a hill. Their total mass is 85 kg. (a) What is their kinetic energy? in J (b) If the rider coasts up the hill without pedaling, how high above its starting level will the bicycle be when it finally rolls to a stop? In m