First Equation of Motion


 
 
Concept Explanation
 

First Equation of Motion

FIRST EQUATION OF MOTION:

large v=u+at,  Final velocity = initial velocity + acceleration large times time interval,

By definition,  large acceleration=frac{change;in;velocity}{time;taken}=frac{final;velocity-initial;velocity}{time; taken}

      or        large a=frac{v-u}{t}Rightarrow at=v-u

      or        large v=u+at                          

Sample Questions
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Question : 1

An object with a mass 5kg moves at a constant velocity of 5ms^-^1. A constant force then acts for 5 seconds on the object and gives it a speed of  2ms^-^1 in an opposite direction. The acceleration caused by the force is:

Right Option : A
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Question : 2

If a car at rest accelerates uniformly to a speed of 144 km/h in 20 sec. It covers a distance of  ___________

Right Option : B
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Question : 3

A bus increases its speed from 36 km/h to 72 km/h in 10 seconds .  Its acceleration is :

Right Option : D
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