What Happens When a Sliding Block Collides with Another on a Flat Surface?

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To solve the problem of a sliding block colliding with another on a flat surface, first calculate the speed of the 2.80 kg block at the bottom of the incline using energy conservation principles. The potential energy at the height of 3.60 m converts to kinetic energy as it slides down the 30° incline. After determining this speed, apply the principles of an elastic collision to find the final speeds of both the 2.80 kg block and the 6.80 kg block at rest. The discussion emphasizes the importance of using energy conservation for the initial speed and the conservation of momentum for the collision. Understanding these concepts is crucial for solving the problem effectively.
lando45
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Hey,

I got this question, and I don't really know how to solve it, I'm stuck:

A block of mass m = 2.80 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 6.80 kg which is at rest on a horizontal surface, Fig. 7-41. (Assume a smooth transition at the bottom of the incline, an elastic collision, and ignore friction.)

7_41.gif


Determine the speeds of the two blocks after the collision.

I worked out the length traveled down the slope using basic trigonometry and got a value of 7.2m, but now I am completely lost and don't know what the next step is...any help?

Thanks a lot,

Rory
 
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Start by finding the speed of the small block using energy conservation and go from there. :)
 

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