Wednesday

November 26, 2014

November 26, 2014

Posted by **David** on Wednesday, February 6, 2008 at 3:12am.

The answer given is 173.6m

I solved it this way

60km/h = 16.667m/s

A=V/T 16.667m/s / -.80m/s^2 = 20.834 seconds

D=RT 16.667m/s x 20.834seconds = 347.24m

This is wrong and I do not understand why. Am I doing it right or is the answer wrong?

- Physics 11 -
**bobpursley**, Wednesday, February 6, 2008 at 7:29amThe last equation....

distance= rate/time. You need the average velocity, not the initial. Average here is 1/2 the initial.

- Physics 11 -
**Binh-An**, Wednesday, February 6, 2008 at 10:12amHi, I'm very familiar with math. I'm 11, and I'm the king of math of my class. Your answer is twice as much as the given answer, David. Hey there, you got the second equation wrong. For the divisor you are supposed to have the time, not the acceleration. Try solving for the time by knowing about integrals (F(a)=v; F(v)=t; this is tricky, I hope it works).

**Answer this Question**

**Related Questions**

algebra - the stopping distance d of a car after the brakes are applied varies ...

algebra 2 - The stopping distance d of a car after the brakes are applied varies...

algebra 2 - The stopping distance d of a car after the brakes are applied varies...

Algebra 2 - The stopping distance d of a car after the brakes are applied varies...

physics help! - The tires of a car make 63 revolutions as the car reduces its ...

Physics - A car travels at 64 mi/h when the brakes are suddenly applied. ...

physics - The tires of a car make 58 revolutions as the car reduces its speed ...

Physics - An automobile is traveling 65 km/hr. It brakes decelerate it 6.o m/s^2...

Physics - A car with good tires on a dry road can decelerate at about 5.0m/s/s ...

Physics - A child drops a ball onto the road 28 m in front of a car travelling ...