A bob is suspended from a carne by a cable of length `l=5m` . The carne and load are moving at a constant speed `v_(0)` The crane is stopped by a bumper and the cable swings out an angle of `60^(@)` . Find the initial speed `v_(0).(g=9.8m//s^(2))`

Answer

A

Explanation

`h=l-lcos60^(@)=(l)/(2)=2.5m`

`v_(0)=sqrt(2gh)=sqrt(2xx9.8xx2.5)=7m//s`