While playing at the swimming pool, a 40-kilogram boy jumps off the side of the pool. when he hits the water, he is traveling 3 m/s. how much kinetic energy does he have right before he hits the water?

180 j

120 j

60 j

40 j

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Match each scenario to the form of energy it represents