A box is sliding on the frictionless floor through a displacement d = (5 m) i + (4 m) j while a constant force F = (-5 N) i + (4 N) j acts on the box. If the box has kinetic energy 15 J at the beginning of displacement d, what is its kinetic energy at the end of displacement d ?

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

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?