A football player releases a football with a speed of 26 m/s and momentum of 12 kg x m/s. What is the mass of the football?

t = 45.5 million years

Explanation:

Initially whole sample is consisting the radioisotope

so initial total mass will be

now after some time we can say the radioactive nuclei is of mass

now we also know that half life is 23 million years

so we have

now we have

t = 45.5 million years

so above is the time interval