A simple pendulum takes 42 sec. to complete 20 oscillations. What is its time period?
A. 2.1 s
B. 4.2 s
C. 21 s
D. 8.40 s
Answer:A
A simple pendulum takes 42 sec. to complete 20 oscillations. What is its time period?
A. 2.1 s B. 4.2 s C. 21 s D. 8.40 s