A tire swing hanging from a branch reaches nearly to the ground (Fig. 11-49). How could you estimate the height of the branch using only a stopwatch?

Solution 8Q

A tyre swing hangs from a branch close to the ground.

We need to estimate the height of the branch using only a stop watch.

The tyre is pulled to one side and then let go. This will act like a pendulum.

The time taken for 10 to and fro motions is noted.

From this the time for 1 oscillation is calculated.

We know that