Block 1 (0.5 kg) travels withan initial velocity of [ 40i ] +[ 60j ] m/s and then collides with block2 (0.5 kg) traveling with an initialvelocity of [ -40i ] + [ -40j ]m/s.
After the collision, block 1 has a finalmomentum of [ 5i ] + [ -25j ]kg*m/s. Assume that no external forces are present andtherefore the momentum for the system of blocks is conserved.

What is the initial momentum of block1?
i +   jkg*m/s

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What is the initial momentum of block2?
i +   jkg*m/s

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What is the total initial momentum of the systemof blocks?
i +   jkg*m/s

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What is the change in momentum for block1? (notice that you are given the final momentum for block1.)
i +   jkg*m/s

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What is the change in momentum for block2?
i +   jkg*m/s

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What is the final momentum of block2?
i +   jkg*m/s

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What is the total final momentum of the system ofblocks?
i +   jkg*m/s

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What is the total change of momentum of the systemof blocks?
i +   jkg*m/s

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What are the initial kinetic energies of block1, block 2, and the system of blocks?
Block 1:  J
Block 2:  J
System of blocks:  J

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What are the final kinetic energies of block 1,block 2, and the system of blocks?
Block 1:  J
Block 2:  J
System of blocks:  J

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What is the change in kinetic energy of the systemof blocks due to the collision?