A car traveling 25 m/s to applies to the brakes to decelerate at 5.5 m/s^2. How long does it take the car to come to a complete stop??

👨🏻‍🏫 學術台物理學

[匿名]

2020-09-16 12:29 pm

回答 (3)

micatkie

2020-09-16 12:46 pm

✔ 最佳答案

Initial velocity, u = 25 m/s
Final velocity, v = 0 m/s
Acceleration, a = -5.5 m/s²

v = u + at
0 = 25 + (-5.5)t
Time taken, t = 25/5.5 = 4.5 s

👍 4 👎 0

Wayne DeguMan

2020-09-16 7:16 pm

We can apply v = u + at and use the values u = 25, v = 0 and a = -5.5

so, 0 = 25 - 5.5t

Hence, t = 25/5.5 = 4.55 seconds

:)>

👍 2 👎 0

oubaas

2020-09-16 1:10 pm

t = V/a = 25 m/sec / 5.5 m/sec^2 = 4.55 sec

👍 1 👎 0