| ⇦ | 
| ⇨ |
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: - A plank with a box on it at one end is gradually raised about the other end.
- A heavy stone hanging from a massless string of length 15 m is projected
- Two bulbs 40 watt and 60 watt and rated voltage 240 V are connected in series
- Depletion layer contains
- A particle of mass ‘m’ is kept at rest at a height 3R from the surface of earth
Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A plank with a box on it at one end is gradually raised about the other end.
- A heavy stone hanging from a massless string of length 15 m is projected
- Two bulbs 40 watt and 60 watt and rated voltage 240 V are connected in series
- Depletion layer contains
- A particle of mass ‘m’ is kept at rest at a height 3R from the surface of earth
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
Leave a Reply