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Chapter 4: Q.7. (page 104)

A rock is thrown from a bridge at an angle 30掳below horizontal. Immediately after the rock is released, is the magnitude of its acceleration greater than, less than, or equal to g ? Explain.

Short Answer

Expert verified

The acceleration of the rock is equal to g.

Step by step solution

01

Step.1.

Model: the rock as a particle. Ignore the air resistance.

02

Step.2.

VISUALIZE: Let's say the initial velocity of the rock isv0.

03

Step.3

As shown above, after the rock is thrown the only external force on the rock is the weight acing vertically. There are no forces acting in the horizontal direction.

Hence the acceleration of the rock is equal to g.

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