Question

a body was falling under gravity a velocity 25m/s.what force is required to stop the body in 2 sec ,if mass of the body is 20kg.​

Answer 1

a= (v-u) /t

a= - 25/2= -12.5 m/s^2

F = M a = - 20× 12.5 N

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Answer 2

Answer: 446N

Explanation:a = 25/2 =12.5 m/s²

Total a = 12.5 + 9.81 (falling through gravity)

= 22.31

So force= mass × acceleration

Force= 20×22.31

= 446 N