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Question No. 10
English
A particle of mass 20 g moves along a circle with a constant tangential acceleration equal to 2 m/s2 What is the magnitude of its velocity when particle moved through a distance 4 m
after starting from rest?
5 mis
0 4 m/s
6 mls
4 mis​

Answer 1

please i did not understand

Answer 2

Given:

A particle of mass 20 g moves along a circle with a constant tangential acceleration equal to 2 m/s².

To find:

What is the magnitude of its velocity when particle moved through a distance 4 m after starting from rest?

Calculation:

First of all, the question clearly states that the tangential acceleration is constant and equal to 2 m/s².

Now, even though the object is travelling in a circular trajectory, its final velocity will still be determined by the equation of linear kinematics.

Applying 3rd equation:

$\sf \therefore \: {v}^{2} = {u}^{2} + 2as$

$\sf \implies \: {v}^{2} = {(0)}^{2} + (2 \times 2 \times 4)$

$\sf \implies \: {v}^{2} = 16$

$\sf \implies \:v = \sqrt{16}$

$\sf \implies \:v = 4 \: m/s$

So, final velocity of object is 4 m/s.