i need to get this question right! help asap please

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

If the area of a square has increased by a factor of 16, by how much has each side increased?

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver