A body starts from rest with an acceleration of 2 m/s². After 5 second,

⇦

⇨

A body starts from rest with an acceleration of 2 m/s². After 5 second, the direction of acceleration reverses again for 5 second. The displacement is

Options

(a) 5 m
(b) 50 m
(c) 55 m
(d) 0 m

Correct Answer:

0 m

Explanation:

Body starts from rest
.·. u = 0, α = 2 m/s², t = 5 sec
S₁ = ut + 1/2 αt² = 0 х 5 + 1/2 х 2 х 5 х 5 = 25 m.
Now when the body reverse its acceleration
so S₂ = 10 х 5 – 1/2 х 2 х 5 х 5 = 50 – 25 = 25 m.
.·. Total distance travelled = 25 + 25 = 50 m.
Note : There is an error in the question. The distance being a scalar, it will be 50 m but displacement being vector, it was come back to the original position. Therefore it is zero.

Related Questions:

1. Imagine a light planet revolving around a very massive star in a circular
2. Across a metallic conductor of non-uniform cross-section, a constant potential
3. Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively
4. Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen
5. The power obtained in a reactor using U²³⁵ disintegration is 1000 kW

Topics: Motion in Straight Line (93)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends