A sample of radioactive phosphorus-32 has a mass of 100 grams and has a half-life of two weeks. A half-life is the time it takes for the mass of a substance to decrease to half of its value. Which series of numbers shows the mass of phosphorus-32 remaining after 2, 4, and 8 weeks?
0.0.0
B
50.00
С
50, 25, 6,25
D
50, 25, 12.5

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

what are you trying to solve here

step-by-step explanation: