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  • A particle is moving along north after moving for 2 sec with a speed of 4 m/s, its speed becomes 5m/s.What is its displacement (in meters) at end of 7 secOption:

A particle is moving along north after moving for 2 sec with a speed of 4 m/s, its speed becomes 5m/s.What is its displacement (in meters) at end of 7 sec

Option: 1

33


Option: 2

43


Option: 3

38


Option: 4

31


Answers (1)

best_answer

 

 

 

Case 1:

\\ \text{time},(t_{1}) = 2 s \\ \text{Velocity},(v_{1})=4 m/s \\ \text{We know}, \\ \text{Displacement},\left ( s_{1} \right )= \text{Velocity}\times \text{time} \\ s_{1}=4\times 2=8m \\

Case 2 :

\\ \text{time},(t_{2}) =7-2=5 s \ ( \text{because for initial 2s it was travelling with different speed} )

\\ v_{2}= 5 \ m/s \\ s_{2}=5\times 5=25 m \\ \text{Total displacement},(s)=s_{1}+s_{2} \\ s=25+8=33 m

 

 

Posted by

Nehul

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