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January 27, 2015

January 27, 2015

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)

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