Gravitational field strength is measured in what units?

Gravitational field strength is defined as the force experienced by a unit mass placed in a gravitational field. This means that it is measured in terms of force (which is in Newtons) per unit mass (which is in kilograms). Therefore, the unit of gravitational field strength is Newtons per kilogram.

This measurement directly reflects how much gravitational force acts on an object for every kilogram of its mass. For example, on the surface of Earth, the gravitational field strength is approximately 9.81 N/kg, indicating that each kilogram of mass experiences a force of about 9.81 Newtons towards the center of the Earth.

The other options do not correctly represent the nature of gravitational field strength. Joules per kilogram is a unit of energy per mass, Pascal is a unit of pressure, and meters per second is a unit of speed, none of which describe the gravitational field strength accurately. Thus, the most appropriate unit for measuring gravitational field strength is Newtons per kilogram.