A small mass m slides with negligible friction down an incline at an angle of 25

Question

A small mass m slides with negligible friction down an incline at an angle of 25.76 with respect to the horizontal. It then drops down to a horizontal surface and bounces elastically back up as shown The picture is to scale. It shows the position of the mass at equal time intervals starting from rest at X. The height of the mass at Q is the same as at T. Click here to view the motion of the mass m The mechanical energy of m at R is equal to that at T The velocity of m at T is equal to that at Q The speed change between X and U is equal to between U and S The speed of m at Q is greater than T that at P The size of the total force on m at U is less than at T The size of the total force on m at V is less than at R The mass is in contact with the ground for a very brief time. Elastically implies that no energy is

Explanation / Answer

1. equal to (because total mechanical energy would be same, KE & PE would vary)

2. equal to (same height, thus same distance travelled, using equation of motion we can say this)

3. less than

4. greater than (because of greater KE, we can say so)

5. less than

6. less than

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