If the spinning speed of the earth increases, then the weight of the body at the equator will

Correct answer: (a) decrease

Explanation

Apparent weight at the equator is reduced by rotation: g' = g − ω²R, where ω is angular speed and R is Earth's radius.

A higher spinning speed (ω) increases the outward centrifugal effect, lowering effective g and thus the body's weight.

The effect is maximum at the equator (zero at the poles), so weight there decreases.