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Traveling Car Physics Question

0 votes
2,162 views

A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure below. 
When the car changes speed it does so uniformly. 
Select the appropriate choice for each statement: T-True, F-False, G-Greater than, L-Less than, E-Equal to. (If the first is T, the second is G, and the rest E, enter TGE 

This is what I got but I keep getting it wrong. Is there a certain equation to find the answers?

The speed is ..... zero at 20 sec. (E) 
At 48 sec, the speed is as high as it gets. (T) 
The speed at 4 sec is ..... the speed at 76 sec. (G) 
The acceleration magnitude at 15 sec is ..... the acceleration magnitude at 37 sec. (L) 
The x-acceleration is ..... zero at 58 sec (G) 
The x-acceleration is ..... zero at 50 sec (G)

asked Sep 11, 2014 in General by anonymous

1 Answer

0 votes
The x-acceleration at 58 sec is negative (-x direction), so should be L.

The x-acceleration at 50 sec is equal to zero (E) -- a straight line of x-t diagram indicates constant velocity. So a is zero.
answered Sep 11, 2014 by PhysicsDude (21,750 points)
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