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Black_prince [1.1K]
3 years ago
9

2. A rock is dropped off a bridge. How fast is the rock

Physics
1 answer:
zhenek [66]3 years ago
5 0

Answer:

a) The velocity of rock at 1 second, v = 9.8 m/s

b) The velocity of rock at 3 second,  v = 29.4 m/s

c) The velocity of rock at 5.5 second,  v = 53.9 m/s

Explanation:

Given data,

The rock is dropped from a bridge.

The initial velocity of the rock, u = 0

a) The velocity of rock at 1 second,

   Using the first equation of motion

                         v = u + gt

                         v = 0 + 9.8 x 1

                          v = 9.8 m/s

b) The velocity of rock at 3 second,

                         v = u + gt

                         v = 0 + 9.8 x 3

                          v = 29.4 m/s

c) The velocity of rock at 5.5 second,

                         v = u + gt

                         v = 0 + 9.8 x 5.5

                         v = 53.9 m/s

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α : angle between force and displacement

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m : mass s (kg)

a : acceleration  (m/s²)

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W: Weight of the cart : In vertical direction

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f : Friction force: parallel to the floor

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