The formula for the time is Time = (speed) / (acceleration) .
If it slows 4 m/s every second, it takes (24/4) = <u>6 seconds</u> to slow from 24 to zero.
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If the speed at the beginning or end of the acceleration is zero, then the formula
for distance during acceleration is D = 1/2 (acceleration) (time)² .
1/2 (acceleration) x (time)² = 1/2 (4) (6)² = 1/2 (4) (36) = <u>72 meters</u>.
When a car hits you in a rear end collision, the car initially has a momentum going in one direction. This causes your car to move in the same direction that car was moving even if you were at rest. So, for conservation of momentum, you initially have momentum going in the east direction for example, after the collision, you will have a change in momentum which causes you to have a velocity in the west direction. This is because you are initially at rest and then there is a sudden change in velocity so when you speed up, that momentum causes you to move backwards. If you don't have a properly adjusted neckrest you could may experience whiplash.
Answer: Speed and velocity are both measured using the same units. The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second .
Explanation: Hopefully this helps you.