Before the driver applies the brakes ( with the reaction time ):
d 1 = v0 · t = 20 m/s · 0.53 s = 10.6 m
After that:
v = v0 - a · t1
0 = 20 m/s - 7 · t1
7 · t1 = 20
t1 = 2.86 s
d 2 = v 0 · t1 - a · t1² / 2
d 2 = 20 m/s · 2.86 s - 7 m/s² · (2.86 s)²/2 = 57.2 m - 28.6 m = 28.6 m
d = d 1 + d 2 = 10.6 m + 28.6 m = 39.2 m
Answer: the stopping distance of a car is 39.2 m.
Answer:
show me some answer choices I think I know what is is
The sum is 41.22 because first you turn all of the fractions into decimals and then it’s easier to add them all together all at once.
Answer:
25%
Step-by-step explanation:
We need to first convert 3/5th to percentage so we are only dealing with percentage.
3/5 doing division would give us 0.6
Multiply that by 100, we get
0.6 * 100 = 60%
Thus, now we can say:
Walking = 15%
Driving = 60%
The remaining time is cycling. How much?
15 % + 60 % + cycling = 100%
75% + cycling = 100%
Cycling = 100 - 75 = 25%