# Physics

Two blocks of masses M and 5M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them, as seen in the figure below:

img404.imageshack.us/img404/8349/sbpic0906.png

1) A cord initially holding the blocks together is burned; after this the block of mass 5M moves to the right with a speed of v1=2.26 m/s. What is the velocity of the block of mass M?

I found the answer for this to be -11.3 m/s (which is correct).

2) Calculate the original elastic energy in the spring if M = 0.340 kg.

I don't know how to do this one! please help. I tried using 1/2mv1^2 + 1/2mv2^2 but no luck :(

1. 👍 0
2. 👎 0
3. 👁 81
1. Nevermind I figured it out... :)

1. 👍 0
2. 👎 0
posted by Brian

## Similar Questions

1. ### physics

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. A cord initially holding the blocks

asked by Anonymous on October 31, 2009
2. ### physics

Three blocks, with masses m1 = 5.90 kg, m2 = 5.50 kg, and m3 = 7.10 kg, are pull on a horizontal frictionless surface by a 18.00 N force that makes a 39 o angle (θ) with the horizontal. What is the magnitude of the tension

3. ### Physics

Consider a force F = 815 N pulling 3 blocks of masses m1 = 7.94 kg, m2 = 15.3 kg, and m3 = 32.4 kg along a frictionless horizontal surface. Find the acceleration a of the blocks. Answer in units of m/s2.

asked by Priscilla on October 9, 2012
4. ### Physics

Two blocks, with masses M1 = 1.4 kg and M2 = 9.9 kg, and a spring with spring constant k = 228 N/m are arranged on a horizontal, frictionless surface. The coefficient of static friction between the two blocks is 0.59. What is the

asked by help? on April 27, 2008
5. ### physics

Two blocks, joined by a string, have masses of 6 and 9kg. They rest on frictionless horizontal surface. A 2nd string, attached only to the 9kg block, has a horizontal force = 30N applied to it. Both blocks accelerate. Find the

asked by Tiffany on October 19, 2008
6. ### Physics

A horizontal forces of magnitude 500N pulls two blocks of masses m1=10 kg and m2=20 kg which are connected by the light inextensible string and lying on the horizontal frictionless surface. Find the tension in the strings and

asked by S on November 5, 2016
7. ### physics

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them as shown in the figure below. A cord

asked by Jackie on January 23, 2011
8. ### physics

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them as shown in the figure below. A cord

asked by Jackie on January 23, 2011
9. ### physics

Two blocks of masses m and M [M = 4.23m] are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. A cord holding them together is

asked by vanessa on January 23, 2011
10. ### physics

The two blocks in the sketch are connected by a light cord over a frictionless pulley and are initially held in place. The block m1 has a mass of 2,00 kg and m2 has a mass of 3,00 kg. The inclined plane is frictionless and the

asked by Lysha on June 8, 2014

More Similar Questions