IQ Test · Kids Question 18 - thichhoctoan.com

Question 18

AI reconstruction: The diagram incorrectly uses “r.p.m.” for linear speed. In this exercise replace that unit everywhere by mm/s. Two equal-mass balls move along one line, with no spin and no external force. The collision is perfectly elastic and head-on. Ball A is initially at rest; B approaches at 5000 mm/s. What happens immediately after the collision?

Question illustration

Both balls disintegrate
Both move in opposite directions at 2500 mm/s
Both move in the same direction at 2500 mm/s
A moves at 5000 mm/s in B’s original direction, and B stops
Both move in opposite directions at 5000 mm/s