Physics problems

Can anyone tell me a good site to ask physics problems?

Re : Physics problems

1.What is the difference between distance and displacement
(A) distance is a Vector, While Displacement is not a vector.
(B) displacement is a vector, while distance is not a vector.
(C) There is no difference between the two concepts; they may be used interchangeably.
explain and why.

Re : Physics problems

2.The velocity of a train is 80.0 km/hr, due west. one and half hours later its velocity is 65.0km/hr, due west. what is the train average acceleration?
(A) 10.0km/H2, due west
(B) 43.3km/h2,due west
(C) 10km/h2 Due east
(D) 43.3km/h2 due east
(E) 53.3km/h2 due east
Pls. Help me to solve this problem W Graph Pls.