Thursday

December 18, 2014

December 18, 2014

Posted by **christina** on Thursday, January 16, 2014 at 9:17pm.

- science/math -
**Reiny**, Thursday, January 16, 2014 at 11:25pmUsing Calculus

a = -4

v = -4t + c

when t=0 , v = 30

30 = 0 + c

v = -4t + 30

s = -2t^2 + 30t + k

when t = 0 , s = 0, so k = 0

s = -2t^2 + 30t

when the car stops, v = 0

4t = 30

t = 30/4 = 7.5 seconds

when t = 7.5

s = -2(7.5)^2 + 30(7.5) = 112.5 m

**Answer this Question**

**Related Questions**

math - a car is traveling at a speed of 30.0m/s encounters an emergency and ...

physics - A car comes to a stop for a stop sign in 4.6 seconds. If it was ...

Engineering Physics - A car and a train move together along straight, parallel ...

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

physics, please help check - A rocket car is traveling on a linear horizontal ...

algebra - The stooping distance d of a car after the brakes are appied varies ...

Algebra - The distance required for an emergency stop for a car varies directly ...

physics - Two cars are traveling along a straight-line in the same direction, ...

physics - Two cars are traveling along a straight-line in the same direction, ...

algebra - The stopping distance d of a car after the brakes have been applied ...