Question

A Bugatti Veyron weighs 1888kg. The manufacturer claims that it can brake from a speed of 400km/hr to a standstill in 10 seconds. How much force do the brakes need to apply to achieve this? Express the force in Newtons. This will involve first converting everything to standard units i.e. metres, seconds

Answer 1

Someone help

Answer 2

Find your acceleration first. It is the change in velocity ÷ change in time.

Answer 3

What is the formula for acceleration i cant figure it out

Answer 4

"change in velocity ÷ change in time."

Answer 5

ok

Answer 6

Might want to convert the 400kph to m/s first.

Answer 7

I can't figure this out at all i am going crazy

Answer 8

Well, 400km to meters is easy (metric is cool like that): just move the decimal point to multiply by a thousand -> 400,000m.
To change from hours to seconds, divide by 3600 - because there are 3600 seconds in an hour.
That'll get your speed in m/s. Since it's going to zero, the change in velocity is 0-initial velocity; you'll get a negative number ('cause it's slowing down).
Divide that by the 10s braking time, and that is your acceleration.

Answer 9

Newton's second law says that force = mass × acceleration, so multiply the acceleration you get by the mass of the car to get the average force during braking.

Answer 10

I got 111.11 for my meter/s then i divide it by ten and get 11.1..times that by 1,888kg and get 20,977.57 this doesn't seem like the right answer

Answer 11

I'd round it to 21,000N because the number of digits in 10s limits the precision.

Answer 12

Alright thanks a lot for the help

Answer 13

You're welcome.
(I hope that car has brakes that can handle that force (it's equivalent to about half a ton!)