Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.Calculation of workMedium2 minQB

PhysicsMediumsingle choice

Passage / Comprehension

A block of mass 10 kg is put gently on a belt-conveyor system of infinite length at t = 0 sec, which is moving with constant speed 20 m/sec rightward at all time, irrespective of any situation by means of a motor-system as shown in the figure. A constant force of magnitude 15 N is applied on the block continuously during its motion. ( $μ_{s} = 0.4, μ_{k} = 0.25$ )

The magnitude of acceleration of the block of mass 10 kg at t = 6 sec is :-

Options:

Answer:

Solution:

By t = 5 s the block already moves with the belt at 20 m/s. The applied 15 N is then balanced by static friction ( $15 N < μ_{s} m g = 40 N$ ), so at t = 6 s the acceleration is zero.

Ans. (D)

Stream:JEESubject:PhysicsTopic:W.E.P.Subtopic:Calculation of work

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...