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  4. A simple pendulum having a bob of mass m is suspended from the ceiling of a car used in a stunt film shooting. The car moves up along an inclined cliff at a speed v and makes a jump to leave the cliff and lands at some distance. Let R be the maximum height of the car from the top of the cliff. The tension in the string when the car is in air is :

Q. A simple pendulum having a bob of mass is suspended from the ceiling of a car used in a stunt film shooting. The car moves up along an inclined cliff at a speed and makes a jump to leave the cliff and lands at some distance. Let be the maximum height of the car from the top of the cliff. The tension in the string when the car is in air is :

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Solution:

The car is in state of free fall. so tension in the string is zero.

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