The atomic mass of an equal to the number of

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?