Sunday

April 20, 2014

April 20, 2014

Posted by **shannon** on Thursday, January 20, 2011 at 1:53am.

also how long does it take the car to travel the first 100 meters?

- physics -
**Damon**, Thursday, January 20, 2011 at 6:26amfirst do the stopping problem

d = Vi t + .5 a t^2

d = 25 t + .5 a t^2

50 = 25 t + .5 a t^2

v = Vi + a t

0 = 25 + at

a t = -25

a = -25/t

combine 50 = 25 t - .5(25t)

50 = .5 (25 t)

t = 4 seconds to stop after applying brakes

a = -25/4 while stopping

Now do the problem

for the first part

x = 25 t until t = 2 where x = 50

then x = 50 + 25(t-2) - (25/8) (t-2)^2

until stopped at x = 100 and t = 6

during deacceleration v = 25 -(25/4)(t-2)

**Related Questions**

Physics - A car is initially travelling at a constant speed of 20 m/s along a ...

Physics - Problem 4- Speedy car, driving at 30 m/s. The driver suddenly ...

Physics - A car parked on a hill. The driver starts the car, accelerates until ...

physics - The driver of the car traveling at a constant 25m/s sees a child ...

physics - The speed limit in a school zone is 40.0 km/hr. A driver traveling at ...

Physics - A car of mass 1550 kg is travelling at 75.0 km/h on a dry horizontal ...

college Physics - A car is traveling at 7.0 m/s when the driver applies the ...

Physics - A 1000-kg car is driving toward the north along a straight road at a ...

PHYSICS - A driver of a 7400 N car passes a sign stating "Bridge Out 30 Meters ...

physics - A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters ...