A glass marble, X, moving with velocity 6ms^-1, collides 'head on' with an identical stationary glass marble, Y. What is the velocity of Y after the collision, assuming that X comes to rest?

Where do magnetic lines of force enter earth?

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?

Which type of reaction is shown in this energy diagram ?