Oblique Collision is also termed as two-dimensional collisions or non-head collision. This is because both the bodies have different line of impact before collision.
Let us consider two bodies of mass m1 and m2 respectively
Initial Velocities are u1 and u2 respectively as shown in Fig. 7.3
Total momentum before collision in x-direction = m1u1 cos1 + m2u2cos2
Total momentum after collision in x-direction = m1u1cos1+ m2u2cos2
According to law of conservation of momentum, total momentum (after collision) in x-direction can be written as-
m1u1cos1+ m2u2cos2= m1u1cos1+ m2u2cos2
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