Question

a car moves 20m/s for 2second and 40m/s for 2 second and 60m/s for next 6 second what is average speed​

Answer 1

Answer:

The initial velocity of car at time t = 0 sec. = at rest

The velocity after time t =1 sec. = 20 m/sec.

The velocity after time t = 2 sec = 40 m/sec.

The velocity after time t = 3 sec = 60 m/sec

Using the relation

v = u + a t,

where u = initial velocity in m/sec,

a= acceleration in m/sec^2

t = time in seconds in which the initial velocity changes from u m/sec to v m/ sec.

we get acceleration a = 20 m/sec^2, in every of time interval of 1 sec. i.e in the interval 0 sec to 1 sec, in the interval 1 sec to 2 sec, in the interval 2 sec. to 3 second. This means that the car is moving with a uniform acceleration, provided the direction of car does not change also.