A spring of negligible mass is compressed between two masses on a frictionless t

Question

A spring of negligible mass is compressed between two masses on a frictionless table with sloping ramps at each end. The masses are released simultaneously. The masses have the same volume, but the density of M1 is less than that of M2. Select the appropriate option for each statement. It is either less than, greater than, or equal to.

1)The speed of M1 is ... the speed of M2 once they both lose contact with the spring.

2)The duration of the force exerted by the spring on M2 is ... the time the force acts on M1.

3)The force exerted by the spring on M1 is ... the force it exerts on M2.

4)The momentum of M1 is ... the momentum of M2 once they both lose contact with the spring.

5)The kinetic energy of M2 is ... 'the kinetic energy of M1 once they both lose contact with the spring.

6)The final height up the ramp reached by M1 is ... the height reached by M2

Explanation / Answer

1. greater than

by the momentum conservation

M1V1 =M2V2

so V1>V2 (M1<M2)

2. equal

3. equal

4. equal
5. less than

KE =P2/2m

6.greater than

V1>V2 (M1<M2)

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