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A train has an initial velocity of 44m/s and an…

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PHYSICS

A train has an initial velocity of 44m/s and an acceleration of -4ms-2. Calculate its velocity after 10 seconds

  • A. 10m/s
  • B. 6m/s
  • C. 8m/s
  • D. 4m/s

QUICK ANSWER…

D

DETAILS…

Data given:

Initial velocity (u) = 44m/s

Acceleration of train (a) = -4ms-2

Final velocity (v) = ?

Time of travel (t) = 10 seconds.

According the first law of motion,

v = u + at

v = 44 + (-4)10

v = 44 – 40 = 4m/s

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is the correct answer.

HELPFUL TIPS…

You may please note these/this:

  • Be careful, acceleration is a vector quantity, and so its direction which is implied by the negative sigh, is very important.

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/culled from 2019 JAMB-UTME physics question 7/

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