6. A child riding a bicycle at an initial speed of 15 meters per second accelerates at -6.0 meters per second. What is the time it takes for the child to come to a rest?

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.