The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of 1% per day. a sample of this radioactive substance has an initial mass of 2.5kg. find the mass of the sample after five days.

2,38kg

Explanation:

Mass in function of time can be found by the formula: , where is the initial mass, t is the time and k is a constant.

Given that a sample decay 1% per day, that means that after first day you have 99% of mass.

, but , so we have , then

Now using k found we must to find .

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle