Acar travels from stop a to stop b with a speed of 30 km/h and then returns back to a with a speed of 50 km/h. find
(i) displacement of the car.
(ii) distance travelled by the car.
(iii) average speed of the car.

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

Debris produced by mining is called

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?