A 15000kg railroad freight car travels on a level track at a speed of 2.5m/s. It collided and coupled with a 25000kg second car, initially at rest with brakes released. What is the speed of the two cars coupled together after collision?

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

What occurs during a combustion reaction

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.