A blue puck with a mass of 4.40×10^−2 kg, sliding with a speed of 0.240 m/s on a frictionless, horizontal air table, makes a perfectly elastic, head-on collision with a red puck with mass m, initially at rest. After the collision, the velocity of the blue puck is 7.0×10^−2 m/s in the same...
Please help, book gives no examples relatively close to this.
A rocket is fired in deep space, where gravity is negligible.
If the rocket has an initial mass of 6000 kg and ejects gas at a relative velocity of magnitude 2000 m/s , how much gas must it eject in the first second to have...