The mass of a radioactive element at time t is given by

where

is the mass at time zero, while

is the half-life of the element.
In our problem,

, t=121.0 s and

, so we can find the initial mass

:
Force = mass * acceleration
F = 15 *8 = 120 Newton
Answer:
a
Explanation:
heat is energy, energy cannot be made or destroyed but transferred
Answer:
Explanation:
<u>1. Name of the variables:</u>

<u>2. Formulae:</u>




<u>3. Solution (calculations)</u>



