4. A 180 kg sumo wrestler on roller skates, rolling at 5 m/s to the left, collides elastically with another sumo wrestler of mass 215 kg who is rolling at 3.5 m/s to the right on his roller skates. If
the speed of the 180 kg wrestler after the collision is 2 m/s in his original direction, what is the
speed of the second wrestler?

m1u1+m2u2=m1v1+m2v2

Explanation:

m1=180

m2=215

u1=5

u2=3.5

v1=2

v2=?

use the above formula

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one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.