a man pushing a wheelbarrow of mass 50 kg with force F inclined at angle of 30 degree with horizontal plane. The coefficient of friction between the wheelbarrow and the ground is 0.5.Draw the free body diagram and calculate the force F.

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.