A stone is dropped from the upper observation deck of a tower, 850 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

When a skydiver jumps from an airplane, his downward velocity, in feet per second, before he opens his parachute is given by  v = 176(1 − 0.834t ),  where t is the number of seconds that have elapsed since he jumped from the airplane. What is the velocity after 6 seconds? (Round your answer to two decimal places.) ft/s

If a rock is thrown upward on the planet Mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by H = 12t - 1.862. (a) Find the velocity of the rock after one second. m/s (b) Find the velocity of the rock when t = a. m/s (c) When will the rock hit the surface? (Round your answer to one decimal place.) t = (d) With what velocity will the rock hit the surface? m/s Submit Answer View Previous Question Question 4 of 27 View Next Question Home My Assignments + Request Extension Copyright© 1998 - 2021 Cengage Learning, Inc. All Rights Reserved TERMS OF USE PRIVACY

A tank contains 3,000 L of brine with 12 kg of dissolved salt. Pure water enters the tank at a rate of 30 L/min. The solution is kept thoroughly mixed and drains from the tank at the same rate. (a) How much salt is in the tank after t minutes? y =     kg (b) How much salt is in the tank after 20 minutes? (Round your answer to one decimal place.) y =