1.

A rock is dropped from a high bridge.After 3 seconds of free fall the speed of rock is;og 4 ms-1b) 29.4 km s-1c) 2940 cms-1​

Answer»

Answer:

c) 2940 cm/s

Explanation:

GIVEN:

Initial velocity (u) = 0 m/s (As it was DROPPED from rest)

Time (t) = 3 seconds

Acceleration (a) = g = 9.8 m/s²

To find:

Final velocity (V)

Method to find:

v = u + at

⇒ v = 0 + (3 * 9.8)

⇒ v = 29.4 m/s = 2940 cm/s

Hence, the speed of the rock after 3 seconds of free FALL was 2940 cm/s.



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