Question

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Answer 1

Answer:

V = U + at

V = 0

a= -4m/s2

t = 20s

U = 20*4 = 80 m/s

Answer 2

final velocity V=0

time taken T= 20s

acceleration. a= -2m/s²

from equation v=u+at

we have

=> u=v-at

=> u = 0 - (-2)×20

=> u = 40m/s²

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