A constant force is exerted on a cart that is initially at rest on an air track. Friction between the cart and the track is negligible. The force acts for a short time interval and gives the cart a certain final speed. To reach the same final speed with a force that is only half as big, the force must be exerted on the cart for a time interval […] that of the stronger force.

+2 votes

 

1. four times as long
2. twice as long
3. equal to
4 half as long as
5. a quarter of
asked Dec 21, 2012 in Physics by Ytwsa ~Expert~ (1,092 points)
    

1 Answer

0 votes

2. twice as long

answered Dec 22, 2012 by CaptainTeemo ~Expert~ (631 points)

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