A body is moving with an initial velocity of 2 kms-1. After a time of 50 secs its velocity becomes 1.5 kms-1, Its acceleration will be:
Correct answer: D. -10 m/s2
- A. 30 m/s2
- B. 40 m/s2
- C. 20 m/s2
- D. -10 m/s2
Explanation
Explanation:The acceleration of the body can be calculated using the formula: a = vf - vi / tSubstituting the given values, we get: a = (1.5 km/s - 2 km/s) / 50s = -0.01 km/s²Multiplying by 1000 to convert km/s² to m/s², we get: a = -10 m/s²Therefore, the acceleration of the body is 10 m/s². The negative sign indicates that the acceleration is in the opposite direction to the initial velocity.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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