Question

QUESTION 19 During your winter vacation, you enter a "dogsled"race across a frictionless frozen lake, in which the sleds are pulled by students instead of dogs. To get started, you pull the sled (mass m-50 kg) with a force of F-100 N at -30° above the horizontal. The sled moves S = 30.0 m, starting from rest. Assume that there is no friction. (3) How long does it take for you to complete this 30 m race? (select the closest value) n FnF V=0 mg mg A 2.545 5.097 C 5.8865 D.10.195 1.7325

Answer 1

Trst As the surface is fisictionless these is no frictional fosce. Now, applied force, F=foon, at an angle, o=30 from the horizontal So, Fosce along xraris , F = F coso.

Fr = 10oxeos 30° = 86.6 N. Now, mass of the block, m= 50 kg. So, acceleration along x-asis, an - Fr. - Qns 8676 = 1.732 m/s?. Now, the mass starts sliding from rest. So initial velocity, uzom. If, at tsee. it esarells a distance s= 30ma then - sa att aneh S=0+ Laneh (as, uzo) & t=5.886 s. coption e).