3. Which of the following quantities change with time?
(a) acceleration (b) momentum (c) kinetic energy (d) none of these
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acceleration
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here three quantities changes with time
a) acceleration is nothing but velocity by time
acceleration (a)=velocity/time
where velocity = displacement/time
where velocity is changed with time
b) momentum is nothing but product of mass and velocity
momentum (P)= mass×velocity
where velocity changes with time
c) kinetic energy is directly proportional to the mass of the object and to the square of its velocity
kinetic energy=1/2 m v²
where velocity changes with the time
hence here three quantities changes with time
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