#1
mass of Sam = 75 kg
velocity of Sam = 18 m/s
now for momentum we can use
#2
Momentum of football = momentum of bullet
#3
As per Newton's law we know that net force is given as
now we have
also we know that
form above equation we have
#4
As per Newton's law we know that net force is given as
now we have
also we know that
form above equation we have
i think the answer is B police siren.
Power of the glasses required is given as +2.5 D
this shows that person is having Farsightedness in which he can objects placed far clearly but he is not able to see clearly to the near objects
For normal vision near point of eye is 25 cm
Let say person can see the objects clearly at distance "d" from the eye
now from the formula
here given that
also we know that
from above equation now
So the distance of object must be 66.6 cm