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A 2.7 kg block with a speed of 5.4 m/s collides with a 5.4 kg block...

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Physics

A 2.7 kg block with a speed of 5.4 m/s collides with a 5.4 kgblock that has a speed of 3.6 m/s in the same direction. After thecollision, the 5.4 kg block is observed to be traveling in theoriginal direction with a speed of 4.5 m/s. (a)What is the velocity of the 2.7 kg block immediately after thecollision? (b) By how much does the total kineticenergy of the system of two blocks change because of the collision?(c) Suppose, instead, that the 5.4 kg block endsup with a speed of 7.2 m/s. What then is the change in the totalkinetic energy?

Part a: 3.6 m/s

Part b: -2.19 J

I can not figure out part c.

Answer & Explanation Solved by verified expert
4.5 Ratings (695 Votes)
here mass of block 1 m1 27 kg mass of block 2 m2 54 kg initial speed of block 1 u1 54 ms initial speed of block 2 u2 36 ms final speed of second block v2 45 ms a    See Answer
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