A ball is rolling down a hill as shown below. The ball has a mass of m = 4.00 kg. At the top of the hill the ball has a velocity of vo = 4.20 m/s. The ball rolls down the hill. Friction does work on the ball as it rolls down the hill. The work done by friction is 70.O J. The hill hasTheight of 8.50 m. The hill does not have a constant slope, and thus does not have constant acceleration. What is the final velocity of the ball at the bottom of the hill? Vo Vf Your answer should include the following 2 Decimal Places Correct SI Units Appropriate sign (only needed for negative answers) Answers must be in the following format: Written out and NOT in scientific notation Acceptable. 278.40 Not Acceptable: 2.784 x 10? Your Answer: Answer units Height