A thief snatches a bag from a person and then moves along a straight road with a constant
velocity of 36 km/h. A police inspector observed the incident snatching. He starts a bike
within 10 s and accelerates it so that he is able to hold the thief after 30 s. The acceleration
of his bike is
(A) 15 m/s2
(B) 1.5 m/s2
(C) 10 m/s2
(D) 5 m/s2
Answers
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(B) 1.5 m/s2 is the correct answer
Procedure to calculate answer-step 1 : find displacement of thief in 30 seconds
Step 2- if the total time required is 30 seconds and the policeman takes 10 seconds to start his bike then it means that he does motion for only 20 seconds
Step 3- Take initial speed (u) = 0m/s and Displacement (S)= 300 m ( same as displacement of thief) and time (t) = 20 s
Step 4- use the following equation to find answer:
S=ut+1/2at^2
Procedure to calculate answer-step 1 : find displacement of thief in 30 seconds
Step 2- if the total time required is 30 seconds and the policeman takes 10 seconds to start his bike then it means that he does motion for only 20 seconds
Step 3- Take initial speed (u) = 0m/s and Displacement (S)= 300 m ( same as displacement of thief) and time (t) = 20 s
Step 4- use the following equation to find answer:
S=ut+1/2at^2
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