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Kinematics Numerical5(Car, time, velocity)

Kinematics Numerical 5: A car traveling at 10 ms accelerates uniformly at -22 ms . Calculate its velocity after 5 s.

Solution:

Here we have data;

 

Initial velocity =Vi= 10m/sec

Acceleration = a= 2 m/sec.sec

Time taken = t = 5 sec

Final velocity = Vf = ?

i-e car  motion was noted from a point where its velocity was 10 m/sec and hence the same is taken as initial velocity .Then velocity was changed at rate of 2 m/sec  and 5 sec passed . Whatever be the velocity just after 5 sec is taken as final velocity — the same we have to calculate!

 

We know the formula for final velocity;

\[ Vf= Vi+at \]

Putting values ;

\[ Vf= 10+(2)5=10+10=20 m/sec \]

 

So the velocity — or final velocity after 5 seconds is 20 m/sec

 

 

 

 

 

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