Answer:
The time take is 
Explanation:
From the question we are told that
The decay constant is 
The percentage fall is 
The equation for radioactive decay is mathematically represented as
Where is 
is the new amount of the new the isotope while 
is the original
At initial 
% = 1
At 
% = 0.80
=> 
=>
the radius of the entire atom was 0.00000001 cm.
Answer: 
Explanation:
The acceleration of the motorcycle is given by
where
v=24 m/s is the final velocity of the motorcycle
u=15 m/s is the initial velocity
t=3 s is the time taken
Substituting these numbers into the equation, we find
Hope this shows! It has all the equations for all of the problems u asked in the comments
