Homework Help: Physics

Posted by Priscilla on Sunday, December 27, 2009 at 7:29pm.

A race car can be slowed with a constant acceleration of -11 m/s^2

a. If the car is going 55 m/s, how many meters will it travel before it stops?

b. How many meters will it take to stop a car going twice as fast?

I'm confused a little, for these two problems they both want distance? or just time for a?

Physics - Priscilla, Sunday, December 27, 2009 at 8:34pm
ok like one of the teachers previously stated to find the time.

V = Vi + at
0 = 55 - 11t
55 = 11t
5 = t

But for this problem i think you have to find two distance.

A, to find the distance
B, to find the distance i guess if the time is doubled, right?
Physics - drwls, Sunday, December 27, 2009 at 10:55pm
A. stopping distance = (stopping time) x (average speed)
= (V/a)*(V/2) = V^2/(2a)

B. If the speed doubles, with deceleration rate "a" staying the same, the stopping distance is four times farther.
Physics - josh, Tuesday, April 9, 2013 at 8:52am
56 mph7 34mph

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