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A 3 kg mass attached to a spring scale r...

A 3 kg mass attached to a spring scale rests on frictionless surface as shown in figure. The spring scale attached to the front end of a box car, reads 15 N when the car is in motion. If the spring reads zero when the car is at rest, determine acceleration of the car while it is in motion

A

`5 ms^(-2)`

B

`10 ms^(-2)`

C

`1 ms^(-2)`

D

`3 ms^(-2)`

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