A woman starts to swim directly across a 2.2-km-wide river. Her speed with respect to the water is 1.7 m/s. The river current carries the woman downstream at a speed of 0.91 m/s. (a) How much time does it take her to cross the river? (b) How far downstream will the river carry her by the time she reaches the other side of the river? m

What force is needed to accelerate a 25kg mass at 20 ms -2 ?

Using the above equation and what you know about kinetic energy and energy conservation, show that the expression for the escape velocity ve from a planet of radius R is .  (Hint:  To just escape the planet, the object’s speed must be 0 infinitely far from the planet.) and find the escape velocity of an object being launched from Earth.  Earth has a radius of  and a mass of .

On Jupiter g is 26.0 m/s/s. If you go skydiving on Jupiter (bad idea) and you were to fall for 5.2 seconds, how far would you travel and what would your speed be?