Relative Motion-1

JEE Main 2015 Discussion Forum › Mechanics questions › Relative Motion-1

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5 Answers

1133

Sourish Ghosh ·2013-03-19 23:09:13

A wins the race.
Time of A = 3 min
Time of B = 7.5 min

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Akash Anand Wrong..try again
Upvote·0· Reply ·2013-03-20 23:25:19
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15

Anomitro Kundu ·2013-03-20 00:23:14

A wins the race..............TIME OF A=3.5 mins
TIME OF B=7.5mins

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Akash Anand Wrong..try again
Upvote·0· Reply ·2013-03-20 23:25:27
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996

Swarna Kamal Dhyawala ·2013-03-21 06:25:53

A wins the race
Time of A =1.5 min
Time of B =2 min

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Akash Anand Wrong..try again
Upvote·0· Reply ·2013-03-21 07:00:23
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1161

Akash Anand ·2013-03-21 07:01:05

Correct Answer:
B wins the race,
Time for A is 165 sec
Time for B is 150 sec

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Swarna Kamal Dhyawala how? please explain
Upvote·0· Reply ·2013-03-21 07:56:07
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1161

Akash Anand ·2013-03-25 00:20:50

Here is the explanation:

Considering for A:
The time it will take to go to the other side (not necessarily at C) will be: 1005(518)sin 37Â° = 120 sec

In that time horizontal drag for him will be:
[(5(518)cos 37Â°)+2(518)]*120=200m

remaining 100m he will travel with 8 km/h so: time = 1008(518) =45 sec

So total time for A is 165 Sec.

Similarly you can do for the B.

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