Kinematics Question 219
Question: A body projected vertically upwards with a velocity $ u $ returns to the starting point in 4 seconds. If $ g=10 $ m/sec2, the value of $ u $ it’s [KCET 1999]
Options:
A) 5 m/sec
B) 10 m/sec
C) 15 m/sec
D) 20 m/sec
Show Answer
Answer:
Correct Answer: D
Solution:
Time of flight $ T=\frac{2u}{g}=4\ \sec \Rightarrow u=20\ m/s $
