What is the kinetic energy of an 80.0 kg football player running at 6.0 m/s?

a)240 j
b)480 j
c)1400 j
d)2900 j

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.