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29 Jun 2009 14:22:40 IST

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a car is moving along a straight road with a uniform acceleration. it passes through two points P an

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a car is moving along a straight road with a uniform acceleration. it passes through two points P and Q separated by a distance with velocity 30km/h and 40km/h respectively. find the velocity of the car midway between P and Q.

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swapnil

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Joined: 26 May 2009

Posts: 100

29 Jun 2009 14:25:08 IST

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dude you need to know the time between the two vel. or the distance bet the ptsor else the question is hypothetical

hurricane

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Joined: 20 Jun 2008

Posts: 191

29 Jun 2009 16:34:07 IST

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apply

v^2-u^2 =2as twice

1600=900+2as

2as=700

for the req answer,

v ^ 2 =900+2a(s/2)

=900+700/2

=1250

v is sqrt(1250)

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