8.An object is thrown upward with a speed of 28.0 m/s. How long does it take to reach itsmaximum height?A)4.70 sB) 0.7 sC) 3.20 sD) 1.15 sE) 2.85 s9.If you coach special teams on a football team, you would want the punter to punt the ball

such that the cover team can be at the receiver before he runs up field. Calculate theinitial velocity of a football punt so that its hang-time is 4.40 s and it travels a distance of49.8 m (over 50 yards).0010.An arrow is shot horizontally with a speed of 20 m/s from the top of a 60 m building.

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Calculate the time it reaches the ground.0

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11.Suppose one force vector is 100 N at= 45, and a second force vector is 75 N at1230both with respect to the positive x-axis. What is a third force that would cause zeronet force if all forces are acting on the same mass particle?12.Suppose one force vector is 150 N at= 450, and a second force vector is 172 N at3000both with respect to the positive x-axis. What is a third force that would cause zeronet force if all forces are acting on the same mass particle?13.Suppose you slide a box across the floor with an initial speed of 10 m/s. If the floor isrough with coefficient of kinetic friction 0.5, how far will it slide? Assume the boxweighs 30 N.14.Suppose you slide a box up an incline of angle0= 100with an initial speed of 10 m/s. Ifthe incline is rough with coefficient of kinetic friction 0.5, how far will it slide up theincline? Assume the box weighs 30 N.15.Suppose you slide a box up a long incline of angle0= 100with an initial speed of 15m/s. If the incline is rough with coefficient of kinetic friction 0.5? How far vertically willthe box rise? Assume the box weighs 40 N and that the initial vertical position is zero atthe base.==