A boat from A crosses a 200 m wide river at a constant speed of 4 m/s with respect to the water flowing at a uniform speed of 1 m/s. Destination B is 80 m upstream from H, a point directly opposites A. (a) In what direction must the boat be pointed to travel from A to B?
(b) How long will the boat take to cross the river?

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s