A person uses a lever to lift a barrel. The person applies 175 Newtons of effort force and pushes the end of the lever 0.8 meter. The never exerts 225 newtons of resistance force. It lifts the barrel 0.5 meter. Fine the work output/ work input , and efficiency of the lever

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