Choose the correct statement (s)

Options

A. Both speed and velocity have the same units.
B. If a body has a speed of `50m s^(-1)` in a striaght line path , then its velocity is `180 km h^(-1)`
C. The speed of a vechicle is measured by a device called speedometer.
D. All the above

Answer

D

Explanation

(i) The unit of speed and velocity is `ms^(-1)`
(2) if a body is moving in a straight line path, then its speed is equal to its velocity
`50 m s^(-1) = 50 xx 18/5 km h^(-1) = 180 km h^(-1)`
The speed of a body (vehicle) can be measured by a device called speedometer.