A 10 N Force, parallel to an incline's surface, pushes a crate 5 m up the 20 degree incline at a constant velocity. a. How much Work is done by the force? b. How much Total Work is done? O a. O b. 50 O a. 0 ) b. OJ a. 50 J b. 50 J a. 50 b. O

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