KCET 2023 | Work, Energy and Power Question 3 | Physics

A ball of mass $$0.2 \mathrm{~kg}$$ is thrown vertically down from a height of $$10 \mathrm{~m}$$. It collides with the floor and loses $$50 \%$$ of its energy and then rises back to the same height. The value of its initial velocity is

Zero

$$14 \mathrm{~ms}^{-1}$$

$$196 \mathrm{~ms}^{-1}$$

$$20 \mathrm{~ms}^{-1}$$

KCET 2022

MCQ (Single Correct Answer)

-0

A smooth chain of length $$2 \mathrm{~m}$$ is kept on a table such that its length of $$60 \mathrm{~cm}$$ hangs freely from the edge of the table. The total mass of the chain is $$4 \mathrm{~kg}$$. The work done in pulling the entire chain on the table is (Take, $$g=10 \mathrm{~m} / \mathrm{s}^2$$)

6.3 J

3.6 J

2.0 J

12.9 J

KCET 2020

MCQ (Single Correct Answer)

-0

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time $$t$$ is proportional to

$$t^{1 / 2}$$

$$t$$

$$t^{3 / 2}$$

$$t^2$$

KCET 2018

MCQ (Single Correct Answer)

-0

Two particles of masses $m_1$ and $m_2$ have equal kinetic energies. The ratio of their momentum is

$m_1: m_2$

$m_2: m_1$

$\sqrt{m_1}: \sqrt{m_2}$

$m_1^2: m_2^2$

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