Find velocity when the kinetic energy is 144 j and mass is 4.5 kg

Abody of weight 60 kg is standing in a lift the lift going upward with a uniform velocity of 4.9 metre per second slows down and stops in two seconds then apparent weight of the body during the slow down process is

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude