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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 |
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Answer» Answer: c) 2940 cm/s Explanation: 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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