Answer:

As we know,

AVERAGE VELOCITY=DISPLACEMENT/TOTAL TIME

HERE, DISPLACEMENT IS 7M BECAUSE THE BODY IS TRAVELLING IN THE SAME DIRECTION AND TOTAL TIME IS 3 SEC.

SO, AVERAGE VELOCITY IS 7/3 M/S

NOW, ACCELERATION=FINAL VELOCITY-INITIAL VELOCITY/TIME

AS WE KNOW SPEED=DISTANCE/TIME

BUT HERE MOTION IS IN STRAIGHT LINE

THEREFORE VELOCITY=DISTANCE/TIME

=5/2=FINAL VELOCITY

INITIAL VELOCITY=0

SO, ACCELERATION=(5/2-0)/2

AND THIS IS EQUAL TO 5/4 M/S

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