A7500 kg open train car is rolling on frictionless rails at 25.0 m/s when it starts pouring rain. a few minutes later, the car's speed is 20.0 m/s. what mass of water has collected in the car?

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

If a sphere and a cure have the same mass and are propelled up a ramp with the same force, which would travel father up the ramp? explain.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative