1) A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point? Attempt at solution: 1/2mv^2 = 1/2m(0.5)v^2 2) An object of mass 10.0 kg is released from the top of an inclined plane which makes an angle of inclination of 30.0 ° with the horizontal. The object slides along the inclined plane. The questions refer to the instant when the object has traveled through a distance of 2.00 m measured along the slope. The coefficient of kinetic friction between the mass and the surface is 0.200. Use g = 10.0 m/s2. How much work is done by the force of friction? Attempt: mgh - mkmgd= 1/2mv^2 I keep getting the wrong answer for this one... is my equation wrong?