A trolley of mass 4 kg moves with a velocity of 0.5 meter per second It colides with a stationary trolley of mass 3 kg. If the trolleys stick together after collision, find the velocity that they of with move

Approximately .

Explanation:

Make use of the fact that total momentum is conserved in collisions.

The momentum of an object of mass and velocity is .

The momentum of the two trolleys before the collision would be:

Thus, the total momentum of the two trolleys right before the collision would be .

Since the two trolleys are stuck to one another after the collision, they could modelled as one big trolley of mass .

The momentum of the two trolleys, combined, is conserved during the collision. Thus, the total momentum of the new trolley of mass would continue to be shortly after the collision.

Rearrange the equation to find the velocity of the two trolleys combined:

.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.