Question

in a 100% elastic collision both momentum and ke are conserved
options: false, can be true or false, true, not enough information

Explanation:

In a 100% elastic collision (also called a perfectly elastic collision), by definition, both momentum (from the law of conservation of momentum) and kinetic energy (KE) are conserved. There is no loss of kinetic energy in such a collision, and momentum is always conserved in isolated systems (which is assumed for collisions being analyzed in this context). So the statement is true.

Answer:

True (the orange option with the white circle, labeled "True")