A block of mass 10 kg is put gently on a...

A block of mass 10 kg is put gently on a belt-conveyor system of infinite length at t = 0, which is moving with constant speed `20 m//sec` towards right at all time.

A constant force of magnitude 15 N is applied on the block continuously during its motion.
The nature of friction acting on the block of mass 10 kg during its motion is

kinetic only

static only

some time kinetic some time static

can't be predicted

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