Applications Of Derivatives Question 342
Question: A particle is moving in a straight line according to the formula $ s=t^{2}+8t+12. $ If s be measured in metre and t be measured in second, then the average velocity of the particle in third second is
Options:
A) $ 14,m/\sec $
B) $ 13,m/\sec $
C) $ 15,m/\sec $
D) None of these
Show Answer
Answer:
Correct Answer: B
Solution:
Average velocity in third second = Distance travelled in third second. = Distance travelled in 3 sec - Distance travelled in 2 sec. $ =(9+24+12)-(4+16+12)=45-32=13 $ .
BETA
