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UPSC Civil Service Exam Questions - Engineering

Q1:

A particle of mass 3 kg moving in a straight line decelerates uniformly from a speed of 40 m/s to 20 m/s in a distance of 300 m. Before it comes to rest, it will travel a further distance pf

A 10 m

B 20 m

C 50 m

D 100 m

ANS:D - 100 m

V2 = u2 + 2 as,
(40^2-20^2)=2 * a * 300.
a=2 m/s^2.
V2=U2+2 as
V=0.
U2=2 as.
20^2 = 2ax2xs,
S = 100m.