Plz me my quiz is in 10 minutes. will mark as brainliest

the car on the roller coaster is released from the position shown and allowed to roll freely.

name two of the forces that affect the motion of the car while it moves on the roller coaster.

describe how the potential and kinetic energy of the car change as the car rolls downhill.

explain why the car cannot reach point x on the third hill, as shown in the picture.

1. Gravity is the force that acts on every object on earth at any time. It is responsible for this car's increasing speed while moving downhill and it's slowing while moving uphill.

Besides gravity, every moving object is affected by the friction force. It is a force resisting the motion and it depends on objects weight and surface features.

2. Kinetic energy of an object is expressed through an equation:

Ek = m • v^2 / 2 (v being the speed)

so we can see that it is directly proportional to the object's speed.

Potential energy, on the other hand, is calculated as:

Ep = m • g • h (h being the height)

so we can see that it's directly proportional to the object's height.

In our case, just before going downhill, the car is at the 25 meters height and it's not moving. That means that it hasn't got any kinetic energy and his potential energy is on the maximum. Starting his downhill movement, the car will lose the height, but it will increase the speed, so his potential energy will start to decrease, while kinetic energy will increase. At the end of the slope, his speed will be at maximum (so will his kinetic energy), but his height will drop (so will his potential energy). When moving uphill, contrary, his height (and potential energy) will rise, but he will lose speed (and kinetic energy), because of the previously mentioned forces. Note that these two energies are opposing; as one increases, other decreases and vice versa.

3. This car started from the hill that was 25 meters high and that was the point of his maximum energy. Third hill is 30 meters high, so that means that it has greater potential energy. Being moved only by gravity, and slowed down by friction which causes the car to lose some energy on overcoming it, the car can never reach higher potential energy on its own, without engines or any other pull force.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.