Question

define acceleration. give its SI unit . a bus starts from rest and then a velocity 72 km per hour in 5 seconds find the acceleration.

Answer 1

Rate of change of velocity with respect to time is known as acceleration.SI unit=m/s^2.
Given-
u=0
v=20 m/s
t=5s
a=v-u/t
a=20-0/5
a=4 m/s^2.

Answer 2

the rate of change of velocity is called acceleration. SI= ms-1
V=72km/h=72×1000÷3600
=20ms-1
t=5sec
a=20÷5
a=4ms-1
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