Ariver has a steady speed of 0.464 m/s. a student swims upstream a distance of 1.00 km and swims back to the starting point.
(a) if the student can swim at a speed of 1.08 m/s in still water, how long does the trip take?
(b) how much time is required in still water for the same length swim?

Arescue plane flying horizontally at spots a survivor in the ocean directly below and releases an emergency kit with a parachute. because of the shape of the parachute, it experiences insignificant horizontal air resistance. if the kit descends with a constant vertical acceleration of, how far away from the survivor will it hit the waves?

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.