the displacement time graph for a body is given below. State whether the velocity and acceleration of body in region BC, CD, DE and EF are positive, negative or zero

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

Three resistance 4,4 and 6 ohms are joined in the series.the total resistance will be