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A 5 kg mass attached to a spring scale r...

A 5 kg mass attached to a spring scale rests on a frictionless , horizontal surface as in figure . The spring scale, attached to the front end of a box car, reads 18 N when the car is in motion .

(a) If the spring reads zero when the car is at rest , determine acceleration of the car while it is in motion .
(b) What will the spring scale read if the car moves with constant velocity ?
(c ) Describe the forces on the mass as observed by someone in the car and by someone at rest outside the car.

Text Solution

Verified by Experts

The correct Answer is:
(a) 3.6ms^(-2)`
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