Latest CAT Aptitude Question SOLUTION: a particle starts from rest and has an acceleration of 4m/s 2 for 20 seconds after that it travels for 30 seconds with constant speed and then undergoes a retardartion of 8m/s2. an

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(#M40040055) CAT Category question ss Keep an EYE

a particle starts from rest and has an acceleration of 4m/s 2 for 20 seconds after that it travels for 30 seconds with constant speed and then undergoes a retardartion of 8m/s2. and come back to rest.the total distance covered

Asked In CAT MohanRaj (9 years ago)

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shashank  (9 years ago)

3parts to cover the distance:- s= s1+s2+s3
part 1:
v=u+at ; u=0,a=4,t=20
=> v=80 ; s1=ut+(1/2)at^2
=> s1= (1/2)*4*20*20
=> s1=800

part2:- v becomes u now
a=0
so, v=u+at
=>v=u=80
s2=ut => 80*30=2400

part3
now particles comes back to rest hence v=0,u=80,a=-8
v^2=u^2+2*a*s
=>0=(-80)^2+(2*(-8)*s3)
s3=400

finally s=s1+s2+s3=800+2400+400=3600
answer will be 3600 m.

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Ram  (9 years ago)

Answer is 1 metre

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