Given that,
The acceleration due to gravity on the surface of the earth = 32 feet/s²
We need to calculate the time
Using formula of time period
On differentiating with respect to l
Put the value into the formula
If the length of the pendulum is decreased to 3.97 feet.
We need to calculate the time
Using formula of time period
Put the value into the formula
We need to calculate the gain time
Using formula for time
Put the value into the formula
Hence, The clock gain the time in 24 hours is 0.001 sec.