Runner A starts at x = 0 and runs with a velocity of +3.0 m/s toward runner B. Runner B starts at the same time at x = 20 m and runs with a velocity of -2.0 m/s toward runner A. Where do they meet, and how much time has clapsed since they started running?

Which of the following is an example of motion in two dimensions?

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

A10 kg box initially at rest is pulled 18 meters across a horizontal, frictionless surface by a 40 n force. what is the block’s final velocity over the 18 meters?