“The distance covered by a moving body in a unit of time is called speed.”
\(V = \frac{d}{t}\)
where;
v = speed
d = distance travelled
t = time taken
“The rate of change of displacement with respect to time is called velocity.”
\(V = \frac{s}{t}\)
where;
v= velocity
Δ\(\vec{S}\) = change in displacement
t = time taken
“ An object that covers an equal distance in an equal interval of time its speed is known as uniform speed.”
“A body is said to have uniform velocity if it covers an equal distance in an equal interval of time in a particular direction.”
“A train covers a distance of 1200 metres in 30 seconds, what is its speed?
Solution:
Step 1: Write the known quantities and point out
quantities to be found.
d=1200m
t=30s
v=?
Step 2: Write the formula and rearrange if necessary.
V = d / t
Step 3: Put the value in formula and calculate
v = (1200 / 30) = 40 ms-1
Thus, the speed of the train is 40 ms-1.