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.

(These are the answers I got but they aren't correct. Help!)
• The size of the total force on m at V is greater than/ less than/ equal to  at S.
• The mechanical energy of m at P is  greater than/ less than/ equal to  that at V.
• The velocity of m at U is  greater than /less than /equal to  that at P.
• The size of the total force on m at R is  greater than/ less than/ equal to  at Q.
• The speed of m at U is greater than /less than/ equal to  that at V.
• The speed change between S and T is  greater than/ less than/ equal to between X and S.

Explanation / Answer

The size of the total force on m at V is greater than at S.

the only force acting is gravitational force Fg = m*g

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