Question

22. You are landing from the jump (coming to stop at the ground h uory (es opposed to To land without u anding injury (as opposed to landing yourself, you bend your knees as you land. This helps to prevent with knees locked straight) because when you are bending your a. by exerting extra force on the floor you are canceling the force the oor exerts on you b. the change in your momentum is lower c. the change in your momentum is higher d. the longer time of the impact makes force that the floor exerts on you e. the impulse of the force that the floor exerts on you is lower is also standing at rest on the gnore friction. The girl's 23. A 40-kg girl, standing at rest on the ice, gives a 60-kg boy, who nore friction. ice, a push. After the speed after the push is push, the boy is moving backward at 2.0 m/s. a. zero b. 1.3 m/s c. 2.0 m/s d. 3.0 m/s e. 6.0 m/s 24. For the ball on the srting that makes circles in horizontal plane, as sho free-body diagram of forces? d. b. a. 25. Bob and Alice (they are twins with identical mass) are riding on a merry-go-round. Bob is at a greater distance from the axis of rotation than Alice. Who has the larger linear velocity? a. Bob b. Alice c. It is same for both of them d. It is same for both them and equal to zero.

Answer 1

Solution:

22) Option D is right As when person will bend the knee the time of impact will increase that will reduce some force.

23) Using conservation of momentum

=> 60 * 2 = 40 * v

=> v = 120 / 40

=> v = 3 m/s (backward)

option D is right

24) option C is right

25) As v = w * r

So, bob will have greater linear velocity

=> option A is right.