Question

what doyou mean by aceleraction of body is 20m/s​

Answer 1

Answer:

Acceleration = Change in Velocity / Change in time

= 20/20

= 1m/s^2

or

Simply apply first equation of motion

V=u + at

Here v(final velocity)= 0m/s

U(initial velocity) = 20m/s

t= 20sec

Therfore

0=20 + a×20

a= -1m/s (retardation of 1m/s)

Explanation:

Hope it is helpful.

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