Question 9 (1 point) Two curling stones collide in a head on elastic collision. The red stone (mass 5.4 kg) is travelling with a velocity of 2.1 m/s [E] when it collides with a blue stone (mass of 5.3 kg) which is travelling 0.22 m/s [E]. After the collision, the red stone is travelling at 1.78 m/s [E]. What is the final velocity of the blue stone? 0.22 m/s [E] 0.55 m/s [E] 0.22 m/s [ W] ( 1.78 m/s[E] Question 10 (1 point) Two planets are separated by 3.0 x 10 m. What is the gravitational force between them if one planet has a mass of 2.5 x 104 kg and the other has a mass of 3.7 x 105 kg? 6.9 x 10-20 N 2.1 x 10-10 N 3.08 N 1.0 x 10-9 NQuestion 6 (1 point) A child does 65J of work while pushing a chair across the floor. The angle between the force and the displacement of the toy is 30. The toy is pushed for a distance of 2.5 m. Calculate the force that the child pushed with. 152 N 1 65 N 30 N O 25 N Question 7 (1 point) What is the mass of a baseball ball with a momentum of 8.84 kg*m/s that is travelling at 34 m/s? 301 kg 38 kg 0.26 kg 0.038 kg Question 8 (1 point) A pickup truck of mass 1950 kg is travelling [w] at 27 m/s when it collides with a brick wall and comes to rest in 1.54 s. What is the average force exerted by the truck on the tree? 34 000 N 81 00ON 53 000 N O 47 N