Question

The average speed of an object is defined to be
(A) One half of the sum of the maximum and the minimum speeds
(B) Distance it travels multiplied by the time it takes
(C) The distance it travels divided by the time it takes
(D) The speed determined over an infinitesimally small time interval
(E) The value of the speed at the midpoint of the time interval

Answer 1

Hint: Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time. Speed is defined as ‘s’.

Complete Solution step by step:
The average speed of an object is the total distance covered by the object upon the time taken to cover the distance by the object
So, $ s = \dfrac{d}{t} $ ,
Here, s = speed, d = distance traveled, t = time elapsed.

Additional information:
Speed can be thought of as the rate at which an object covers distance. Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour or, in the US and the UK, miles per hour.

Note:
Guinness World Records recognized NASA's X-43A scramjet with a new world speed record for a jet-powered aircraft - Mach 9.6, or nearly 7,000 mph. The X-43A set the new mark and broke its own world record on its third and final flight in November.