Change in position with respect to the surroundings is called
Change in position of a body with respect to its surrounding is called as motion.
The earliest clocks for measuring time during day were
Sundials were used for measuring time in earlier days on the basis of shadow position.
The speed of the vehicle is recorded by
The speed of vehicle at particular point of time is recorded by speedometer fitted on the dashboard of vehicle.
S.I unit of speed is
S.I unit of speed is meter per second (m/s) which is equal to distance travelled in one second.
One hour is equal to
One hour = 60 minute and one minute = 60 seconds. Therefore, one hour= 60 x 60 = 3600 seconds.