Question

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Answer 1

Explanation:

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Answer 2

Initial velocity,u=20ms‐¹

final velocity,v=0ms-¹

distance,S=10cm

we know that,

2as=v²-u²

2×a×10=0²-20²

20a= -400

a= -400÷20

a=-20

hence, retardation produced is 20ms-¹.

I hope that you will understand easily.