Why not two balls a and b moving with velocity 20 m per second and 25 m per second respectively of equal mass 5 kg find if a is behind b after collision then strike together?
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We use conservation of kinetic energy as we cannot use conservation of linear momentum as direction of the ball after collision is not known
KE before collision =12=12m.102+0m.102+0
=50mJ=50mJ
KE after collision =12=12m×82+12m×82+12mv2mv2
=(32+12=(32+12mv2)Jmv2)J
32m+1232m+12mv2=50mmv2=50m
v2=36v2=36
v=6v=6m/sm/s
Since we see that 102=82+62102=82+62
The two balls must be moving at right angles to each other.
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