What is one measurement needed to calculate the speed of an object? direction, mass, time, or velocity? ?

Option C = Time

Explanation:

Speed:

''It is the distance travel in per unit time". It tells the capacity of moving object how fast it is moving. It is scalar quantity and can be explain just in term of magnitude. It does not require direction. For example we can say that someone is moving fast or moving slow. We are telling the magnitude of speed either its high or slow. If the object is not moving then its speed will be zero.

Formula:

r = d / t

r = speed   (it can also be represented by v)

t = time taken to cover the distance

d =  distance

Unit:

The system international unit of speed is m/s. It can also be given in Km/h

Example:

A car cover the 300 Km distance in a four hour. what is the speed of car?

Given data:

Distance = 300 km

Time = 4 hr

speed = ?

v = d / t

v = 300 km / 4 hr

v = 75 km/ hr

The speed of car is 75 km/hr.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: