Correct Answer - Option 2 :
\(m\frac{v-u}{t}\)
Concept:
Momentum
The force multiplied by velocity gives momentum.
It is having unit Newton second or kg m s - 1.
Second Law of Motion
The rate of change of momentum is directly proportional to the external unbalanced force.
\(F \propto \frac{Δ p}{Δ t}\)
Δp is the change in momentum in time Δt.
Experimentally
\(F = \frac{Δ p}{Δ t}\)
Calculation:
Given, initial speed u, final speed v, mass m
Then Change in momentum Δp = mv - mu
So, we can say
\(F = \frac{mv - mu}{Δ t} = m \frac{v-u}{t}\)
So the correct option is \(m\frac{v-u}{t}\)
1. Newton’s first law of motion
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It states that every object will remain in uniform motion in a straight line unless forced to change its state by the action of an external force.
It gives the basics idea of force.
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2. Newton’s second law of motion
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It states that force applied is equal to change in momentum per unit change in time.
Force (F) = Mass (m) × Acceleration (a)
It gives the formula and final definition of the force.
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3. Newton’s third law of motion
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It states that for every action, there is an equal and opposite reaction.
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