There are four people in the car, the driver slams on the gas pedal and all the passengers heads hit the headrest behind them when the car accelerates forward. The reason the passengers' heads hit the headrest is because the passengers were at rest before the car started moving. Is this statement true or false?

True

Explanation:

Newton's first law (aka inertia) tells us that an object at rest tends to stay at rest and an object at motion tends to stay at motion. In this case, the passengers' heads were at rest, so they will tend to stay at rest when the car accelerates.

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation:

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.