D Question 20 6 pts A 25-kg child starts from rest and attains a speed of 4 m/s at the bottom of a 27 slide of length 6 m. The coefficient of the kinetic friction of the slide is O 0.22 O 0.19 O 0.08 0 0.44 0 0.36 Question 21 6 pts As shown in the figure, a 1.5 kg box is held at rest against a spring with a force constant k = 770 N/m that is compressed a distance d. Equilibrium position -d -1 v=0' ough patch WWWWWW.D Question 21 6 pts As shown in the figure, a 1.5 kg box is held at rest against a spring with a force constant k = 770 N/m that is compressed a distance d. Equilibrium position d - 1 rough patch 6.0 cm When the box is released, it slides across a surface that is frictionless, except for a rough patch that has a coefficient of kinetic friction MK = 0.40 and is 6.0 cm in length. If the speed of the box is 1.6 m/s after sliding across the rough patch, determine the initial compression d (in cm) of the spring. O 9.63 cm 0 7.68 cm O 9.36 cm O 7.86 cm D Question 22 6 ptsQuestion 22 6 pts A 6.00 g bullet has a muzzle velocity of 270 m/s when fired by a rifle with a weight of 20.0 N. If a marksman with a weight of 625 N holds the rifle firmly against his shoulder, determine the recoil speed O 0.0146 m/s O 0.197 m/s O 0.162 m/s 0.0246 m/s D Question 23 6 pts A 0.480 kg ball of Play-Doh hangs from the ceiling by a string. A 0.0850 kg wad of Play-Doh is thrown straight upward from below the ball and strikes the ball with a speed of 5.70 m/s and sticks to it. How high (in cm) does the combined mass of Play-Doh rise above the original position of the ball of Play-Doh?D Question 23 6 pts A 0.480 kg ball of Play-Doh hangs from the ceiling by a string. A 0.0850 kg wad of Play-Doh is thrown straight upward from below the ball and strikes the ball with a speed of 5.70 m/s and sticks to it. How high (in cm) does the combined mass of Play-Doh rise above the original position of the ball of Play-Doh? O 3.48 cm 3.61 cm O 3.75 cm O 3.57 cm D Question 24 6 pts An object at rest explodes, breaking into two pieces. One piece (m2) has six times the kinetic energy of the other piece (m1). What is the ratio of the masses of the two pieces?Question 25 6 pts A pulley and string arrangement is used to connect two objects A and B as shown in the diagram below. B A Here, MA = 4.90 kg and mB = 8.20 kg. The string connecting the two objects is of negligible mass and the pulley is frictionless. The objects start from rest and move with constant acceleration. What is the magnitude of the acceleration (in m/s2) of each of the objects? 5.6 m/s2 O 2.58 m/s2 2.47 m/$2 5.9 m/s2