Find, to the nearest metre, the distance between points P and R.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Hi, I've submitted this question 4 times now and have gotten 4 different results for part b and c.

 

My answer for part b was - a = -0.02    and b = 0.08

 

I just want to confirm whether that is correct, and the answer to part c.

 

Thanks.

A car is travelling on a straight horizontal road. The velocity of the car, vms, at time t seconds as
it travels past three points, P. Q and R, is modelled by the equation
v = at² +bt +c,
where a, b and c are constants.
The car passes P at time t= 0 with velocity 8 ms.
(a) State the value of c.
The car passes Q at time t 5 and at that instant its deceleration is 0.12 ms2. The car passes R at
time t= 18 with velocity 2.96 ms.
(b) Determine the values of a and b.
(c) Find, to the nearest metre, the distance between points P and R.
Transcribed Image Text:A car is travelling on a straight horizontal road. The velocity of the car, vms, at time t seconds as it travels past three points, P. Q and R, is modelled by the equation v = at² +bt +c, where a, b and c are constants. The car passes P at time t= 0 with velocity 8 ms. (a) State the value of c. The car passes Q at time t 5 and at that instant its deceleration is 0.12 ms2. The car passes R at time t= 18 with velocity 2.96 ms. (b) Determine the values of a and b. (c) Find, to the nearest metre, the distance between points P and R.
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