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A heavy body of mass 25 kg is to be dragged along a horizontal plane (µ= 1/√3). The least force required is (1 kgf= 9.8 N). (a) 25 kgf (b) 2.5 kgf (c) 12.5 kgf (d) 6.25 kgf
Updated Tue, 13 Nov 2018 04:31 pm


A 20 kg block attached to an spring of spring constant 5 N/m is relesed from rest at A. The spring at this instant is having an elongation of 1 m. The block is allowed to move in smooth horizontal slot with the help of constant force of 50 N in the rope as shown. The velocity of block as it reaches B is (assume the rope to be light)
(a) 4 m/s
(b) 2 m/s
(c) 1 m/s
(d) 3 m/s
Updated Mon, 01 Oct 2018 12:28 pm