Based on the units given for displacement and time, what will the units for velocity be?

m/sec is the unit of velocity.

Explanation:

The displacement is a vector quantity. It is a measure difference between the end and start point of a moving object.

The displacement of an object is measured in metres, kilometers, centimeter or inches. But the SI unit of displacement is always converted to metres.

The time may be in minutes, hours or second, but the SI unit of time is sec

velocity with respect to displacement is defined as rate at which displacement changes with time.

from the formula :

velocity=diplscement/time

             = m/sec

So the SI unit of velocity is m sec

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.