A car with a mass of 1300 kg is initially moving at a speed of 40 km/h when the brakes are applied and the car is brought to a stop in 15 m. Assuming that the force that stops the car is constant, find (a) the magnitude of that force and (b) the time required for the change in speed.
If the initial speed is doubled and the car experiences the same force during the braking, by what factors are (c) the stopping distance and (d) the stopping time multiplied? Show your work.
2007-09-09 12:38:18 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
A student posts a verbatim quote of their homework assignment and expects it to be answered. Will the student learn anything except how to avoid thinking? Show you work.
Extra credit question. Why are there so many of these homework questions here?
2007-09-09 12:46:13 · answer #1 · answered by just typing out loud 4 · 0⤊ 0⤋
let V0 be initial speed, a be the acceleration (decelleration), m be the mass of the car, F be the force acting on the car, x be the stoping distance, and t be the time. Then
0 = V0 - at²
0 = v0² - 2ax
F = ma
Plug 'n chug ☺
Doug
2007-09-09 12:46:22 · answer #2 · answered by doug_donaghue 7 · 0⤊ 0⤋
i HATED physics in school. especially quantam physics god damn that was a pain in the a.s.s. there should be a formula for that problem. i haven't taken a physics course in 5 years so i don't remember it look through your class notes.
2007-09-09 12:42:59 · answer #3 · answered by Anonymous · 0⤊ 0⤋