# Science Check

1)Two balls having the same mass of 1 kg roll toward each other, each moving at the same speed of 1 m/s. What is the combinded momentum?

Would it be 0 kg m/s

2)A 30 kg girl and a 25kg boy face each other on friction free roller blades. The girl pushes the boy who moves away at 1 m/s. The girls speed is?

Would it be .45

3)The power extended when a 10 N barbell is raised 2.0 m in 2 s is _____ watts
would it be 40?

4)Car A travels for times as fast as Car B. When braking to a stop Car A skids____ times as far as car B.

16?

(1) yes
(2) no. 30*Vgirl = -25*Vboy
Solve for Vgirl when Vboy = 1
(3) no. DIVIDE the work by the time
(4) yes. 4^2 = 16 Do you know why the skid is proportional to the square of speed? It has to do with kinetic energy

1. 👍 0
2. 👎 0
3. 👁 137
1. would it be 55

1. 👍 0
2. 👎 0
posted by jeremy

## Similar Questions

1. ### science

In the diagram above, the arrows represent momentum. A larger arrow indicates more momentum. Which of the following best describes how the balls will move after ball A collides with ball B? (1 point) 1. Ball A will bounce off of

asked by help pls on February 22, 2016
2. ### physics

Two balls have the same mass. One ball moving along the positive x-axis and the other ball moving along the positive y-axis undergo perfectly inelastic collision. What can you say about the motion of the balls after the collision?

asked by shusha on January 4, 2016
3. ### Physics

Two balls of equal mass (400g each) undergo a collision. One ball is initially stationary. After the collision, the velocities of the balls make angles of 22.5 degrees and 35.9 degrees relative to the original direction of the

asked by Zobia on March 22, 2015
4. ### Physics

Two small pith balls, each of mass m = 17.4 g, are suspended from the ceiling of the physics lab by 1.2 m long fine strings and are not moving. If the angle which each string makes with the vertical is = 17.9°, and the charges on

asked by Phil on September 5, 2014
5. ### Physics

Two small pith balls, each of mass m = 16.6 g, are suspended from the ceiling of the physics lab by 1.8 m long fine strings and are not moving. If the angle which each string makes with the vertical is è = 19°, and the charges

asked by Sami on June 6, 2012
6. ### Physics

Two small pith balls, each of mass m = 10.1 g, are suspended from the ceiling of the physics lab by 0.8 m long fine strings and are not moving. If the angle which each string makes with the vertical is è = 42.1°, and the charges

7. ### physics

Two small pith balls, each of mass m = 16.6 g, are suspended from the ceiling of the physics lab by 1.8 m long fine strings and are not moving. If the angle which each string makes with the vertical is è = 19°, and the charges

asked by Becky on June 6, 2012
8. ### motion

A ball of mass 1000g moving with 7m/s impinges another ball of twice its own mass and moving with 1/6th of its own velocity and moves in the opposite direction. If the coefficient of restitution is 0.75, calculate the velocities

asked by aboddu on November 21, 2016
9. ### Science

A ball of mass 1000g moving with 7m/s impinges another ball of twice its own mass and moving with 1/6th of its own velocity and moves in the opposite direction. If the coefficient of restitution is 0.75, calculate the velocities