| ⇦ | 
| ⇨ |
A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the 7th second is
Options
(a) 10 cm/s
(b) 20 cm/s
(c) 5 cm/s
(d) 30 cm/s
Correct Answer:
10 cm/s
Explanation:
Let u and a be the initial velocity and uniform acceleration of the body.
Using kinematic equation, S = ut + (1/2) at²
.·. 200 = u × 2 + (1/2) a × 2²
⇒ 100 = u + a ——-(i)
Also 420 = 6u + (1/2) a × 6²
⇒ 70 = u + 3a ——-(ii)
Solving equation (i) and (ii), we get u = 115 cms⁻¹, a = -15 cms⁻²
Using equation, v = u + at .·. v = 115 + (-15) × 7 = 10 cms⁻¹
Related Questions: - Two capacitors having capacitances C₁ and C₂ are charged with 120V and 200V batteries
- If 10000 V is applied across an X-ray tube, what will be the ratio of de-Broglie
- The dimensions of latent heat are
- All components of the electromagnetic spectrum in vacuum have the same
- In a franhofer diffraction experiment at a single slit using a light of wavelength
Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two capacitors having capacitances C₁ and C₂ are charged with 120V and 200V batteries
- If 10000 V is applied across an X-ray tube, what will be the ratio of de-Broglie
- The dimensions of latent heat are
- All components of the electromagnetic spectrum in vacuum have the same
- In a franhofer diffraction experiment at a single slit using a light of wavelength
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