Question

the time Period of a simple pendulum, that takes 42 seconds to complete 20 oscillations,equal to2.1seconds.true or false?

Answer 1

yes its true because the formula says that
no. of oscillation /no. of seconds

Answer 2

No. of oscillations completed by the pendulum= 42 

Time taken to complete 42 oscillation= 20 seconds 

Time period= No. of oscillations completed/Time taken 

Time period= 42/20 

= 21/10 (cancelled by 2) 

= 2.1 

Time period= 2.1 seconds