Question

Please anyone explain the 10th question in the above pic

I know the answer but I just need explanation

No irrelevant answers please

Answer 1

Since, the velocity is constant , the acceleration will be zero.

( Acceleration = (v-u) / t. )

Since , the acceleration is zero, the external Force acting upon it will be Zero.

(Force = mass × acceleration.)

Hence, the frictional force that will act upon it will be 200N . i.e. in the direction opposite to the direction of motion.

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