Applications Of Derivatives Question 130
Question: A stone thrown vertically upwards rises -s- metre in t seconds, where $ s=80t-16t^{2} $ , then the velocity after 2 seconds is
[SCRA 1996]
Options:
A) 8 m per sec
B) 16 m per sec
C) 32 m per sec
D) 64 m per sec
Show Answer
Answer:
Correct Answer: B
Solution:
$ s=80-16t^{2} $ , $ \frac{ds}{dt}=v=80-32t $
$ {{(v)} _{t=2}}=80-64=16m/sec $ .
BETA
