Question
A body is moving vertically upwards. Its velocity changes at a constant rate from $50 m s^{-1} to 20 m s^{-1} in 3 s$. What is its acceleration?
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Answer
Here, final velocity $= 20 m/s$ Initial velocity $= 50 m/s$
Time taken $= 3 s$
Acceleration = (Final Velocity - Initial Velocity)/time $= (20 - 50)/3 m/s^{-2} = -10 m/s$
Negative sign here indicates that the velocity decreases with time, so retardation is $10 m/s.$
Time taken $= 3 s$
Acceleration = (Final Velocity - Initial Velocity)/time $= (20 - 50)/3 m/s^{-2} = -10 m/s$
Negative sign here indicates that the velocity decreases with time, so retardation is $10 m/s.$
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