Question

Compare the time period of two simple pendulum of length 4.9m and 8.1m.​

Answer 1

refer to attachment..its correct one

first assume two cases then apply formula of time period for simple pendulum in both of them

case one has length 4.9 metre and case 2 has length 8.1 m since 49 and 81 are square of 7 and 9 the calculation is easy to solve , get both the answers and compare them ...