Kinematics Question 195
Question: A stone is dropped from a certain height which can reach the ground in 5 second. If the stone is stopped after 3 second of it’s fall and then allowed to fall again, then the time taken by the stone to reach the ground for the remaining distance is [MNR 1985]
Options:
A) 2 sec
B) 3 sec
C) 4 sec
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
Total distance $ =\frac{1}{2}gt^{2}=\frac{25}{2}g $ distance moved in 3 sec $ =\frac{9}{2}g $ Remaining distance $ =\frac{16}{2}g $ If t it’s the time taken by the stone to reach the ground for the remaining distance then
$ \Rightarrow \frac{16}{2}g=\frac{1}{2}gt^{2}\Rightarrow t=4\ \sec $
