The velocity of a particle at an instant is 10 ms⁻¹.After 3 s its velocity will become

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The velocity of a particle at an instant is 10 ms⁻¹.After 3 s its velocity will become 16 ms⁻¹.The velocity at 2 s before the given instant, will be

Options

(a) 6 ms⁻¹
(b) 4 ms⁻¹
(c) 2 ms⁻¹
(d) 1 ms⁻¹

Correct Answer:

6 ms⁻¹

Explanation:

Given: v=16 ms⁻¹;u=10 ms⁻¹;t= 3s; a=?
v=u+at
16=10+a(3)
3a=16-10⇒3a=6⇒a=2 ms⁻²
before 2 s,⇒10=u+2×2⇒u=6 ms⁻¹.

Related Questions:

1. A radioactive element forms its own isotope after 3 consecutive disintegrations.
2. The rest energy of an electron is
3. A body of mass 3 kg is under a constant force which cause a displacement
4. The frequency of light ray having the wavelength 3000Å is
5. Which of the following figures represent the variation of particle momentum

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

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