Question: (17%) Problem 3: A 61.5-kg sprinter accelerates from 2.2 m/s to 7.85 m/s over a distance of 24.5 m. him. Calculate the average force,

(17%) Problem 3: A 61.5-kg sprinter accelerates from 2.2 m/s to 7.85 m/s over a distance of 24.5 m. him. Calculate the average force, in newtons, that the sprinter exerts backward on the track, if he encounters a headwind that exerts an average force of 28 N against F ave Grade Summary Deductions 0% Potential 100% (17%) Problem 5: A 0.25 kg ball is suspended from a light 1.3 m string as shown. The string makes an angle of 24 with the vertical. Let U=0 when the ball is at its lowest point (0 = 0). L Otheexpertta 50% Part (a) What is the gravitational potential energy, in joules, of the ball before it is released? 50% Part (b) What will be the speed of the ball, in meters per second, when it reaches the bottom? y= Grade Summar Deductions Potential (17%) Problem 6: A bowling ball is dropped from the top of a building that has a height of h = 155 m. 33% Part (a) Assuming air resistance is negligible, what is the ball's speed, vein m/s, when it strikes the ground? V=55.11 Correct! 33% Part (b) If drag produces an opposing force of 10 N while the ball's falling, what is the ball's speed, vein m/s, when it strikes the ground? Assume the ball has a mass of 5 kg. vf= EMN4 5 6 HOME - sin() cos tan ( ) 7 8 9 cotan asin( acos atan() acotan() sinh() cosh() tanh() cotanh Degrees Radians * 1 2 3 = - 0 END VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Feedback: 10% deduction per feedback. Grade Summary Deductions Potential 0% 100% Submissions Attempts remaining: 5 (20% per attempt) detailed view Hints: 10% deduction per hint. Hints remaining: 7 33% Part (c) A different ball was dropped and the final speed was measured to be v+= 8.5 m/s while the drag force was measured to be 50 Newtons. What is the mass of this ball in kg?

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