Aman runs at a velocity of 6.2 m/s for 11.5 minutes. when going up and increasingly steep hill, he slows down at a constant rate of 0.25 m/s^2 and comes to a stop. how far did he run?

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?