Astone is dropped into a river from a bridge 44.0 m above the water. another stone is thrown vertically down 1.72 s after the first is dropped. both stones strike the water at the same time. what is the initial speed of the second stone?

How is the gravitational force related to the distance between two objects?

In science and physics what is the standard unit of measure for speed?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.