# physics

posted by .

A 48 kg cart is moving across a frictionless floor at 3.3 m/s. A 50 kg boy, riding in the cart, jumps off the cart so that he hits the floor with zero velocity.

a.What is the velocity of the cart after the boy jumped?
b.What was the change in momentum of the boy?
c. What impulse did the boy receive?
d.What was the change in momentum of the cart?
e. What impulse did the cart receive?

• physics -

a. Use conservation of momentum
(48 + 50)*3.3 = 48*Vfinal
Vfinal = 3.3*(98/48) = ___ m/s
b. The boy loses his initial momentum. The change is -50*3.3 = - ___ kg*m/s
c. Same answer as (b) (backwards)
d. Sama answer as (b) (but forwards)
e. Same answer as (b) (but forwards)

## Similar Questions

1. ### physics

A 50. kg cart is moving across a frictionless floor at 2.0 m/s. A 70. kg child, riding in the cart, jumps off so that the child hits the floor with zero velocity. What was the velocity of the cart after the boy jumped?
2. ### physics

A 50. kg cart is moving across a frictionless floor at 2.0 m/s. A 70. kg child, riding in the cart, jumps off so that the child hits the floor with zero velocity. What was the velocity of the cart after the boy jumped?
3. ### physics

A 14.0 kg cart is moving with a velocity of 7.25 m/s down a level hallway. A constant force of -10.0 N acts on the cart, and its velocity becomes 3.20 m/s. Assume that air resistance is negligible. (a) What is the change in kinetic …
4. ### Physics

A 3.0-kg cart is rolling along a frictionless, horizontal track towards a 1.2-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. …
5. ### PHYSICS

A Few questions- please help!!! also show steps! What magnitude of force, acting for 0.025 s, will change the velocity of a 100 g ball from 30 m/s eastward to 40 m/s westward?
6. ### Physics

A 45 kg cart is moving across a frictionless floor at 1.7 m/s. A 60 kg boy, riding in the cart, jumps off the cart so that he hits the floor moving forwards in the initial direction of the cart's motion with a velocity of 2.8 m/s. …
7. ### physics

A 2.4-kg cart is rolling along a frictionless, horizontal track towards a 1.3-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. …
8. ### physics

A full shopping cart requires a force of 88.0 Newtons to move across a horizontal floor at a constant velocity. If the cart has a mass of 32.1 kg, what is the coefficient of kinetic friction between the cart and the floor?
9. ### Physics

A 50 kg boy runs at a speed of 10 m/s and jumps onto a cart. The cart is initially at rest. The speed of the cart with the boy on it is 2.50 m/s. a)What is the initial momentum of the boy?
10. ### physics

A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.5-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. …

More Similar Questions

Post a New Question