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In fig. shown, the speed of the truck is...

In fig. shown, the speed of the truck is v to the right. Find the speed with which the block is moving up at `theta=60^(@)`.

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Sum of total change on segment lengths should be zero.

`(+x)+(0)+(-y)+(-y)+(0+ x cos theta)=0`
`2y=x+x cos theta`
`y=x/2 (1+cos 60^(@))=x/2 (1+1/2)`
`y=(3x)/(4) implies v_(block)=3/4 v_(trcuk)`.
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CENGAGE PHYSICS ENGLISH-NEWTON'S LAWS OF MOTION 1-Exercise 6.3
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