Question 10 (1 point) The acceleration of an object sliding along a frictionless ramp that is inclined at an angle 8 is Question 11 [1 point) A box of 2.2 kg is pushed with a force of 35 N up a slanted ramp at an angle of 25 with the horizontal. If the kinetic friction force is 11 N acts opposite to the motion. what is the box's acceleration? O 3.9 m/52 O 5.0 m/52 O 6.3 m/52 O 11 m/s2 0 2.0 m/sz Question 12 [1 point) A rock is tied to the end of a 48 cm long string and whirled around in a circle on a vertical plane. The tension in the string becomes zero when the speed of the rock is O 9.3 m/s O 93 cm/s O 2.2 m/s 0 4.7 m/s 0 22 cm/s