Why do pendulum clocks usually lose time in summer?

A pendulum clock can run faster in –

The time period of a pendulum –

When a stone tied to a string is whirled in a circle, the work done on it by the string:

A girl is swinging on a swing in sitting position. When the girl stands up, the period of the swing will :

An object is launched horizontally from a height of 45 m above the ground with a speed of 10 m/s. The time at which the object will hit the ground is: (Take g = 10 m/s²)