A body of mass 10 kg is moving with a velocity of 4 m s -1- Find the kinetic energy and momentum of the body respectively-A- 400 J and 40 kg m s -1B- 80 J and 160 kg m s -1C- 80 J and 40 kg m s -1D- 200 J and 160 kg m s -1

The correct option is C 80 J and 40 kg m s^ 1 Kinetic energy (K.E.) = 1/2 mv^2 So, K.E. = 1/2× 10 ×4^2 = 80 J Momentum (P) = mv, where m is the mass and ...

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Standard IX

Physics

Fundamental and Derived Quantity

A body of mas...

Question

A body of mass $10 k g$ is moving with a velocity of $4 m s^{- 1}$ . Find the kinetic energy and momentum of the body respectively.

$80 J$ and $40 k g m s^{- 1}$

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$200 J$ and $160 k g m s^{- 1}$

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$400 J$ and $40 k g m s^{- 1}$

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$80 J$ and $160 k g m s^{- 1}$

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Solution

The correct option is A
$80 J$ and $40 k g m s^{- 1}$

Kinetic energy $(K . E .) = \frac{1}{2} m v^{2}$

So, $K . E . = \frac{1}{2} \times 10 \times 4^{2} = 80 J$

Momentum $(P) = m v$ , where $m$ is the mass and $v$ is the velocity.

$P = 10 \times 4 = 40 k g m s^{- 1}$

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A body of mass 10 kg is moving with a velocity of 4 m s−1. Find the kinetic energy and momentum of the body respectively.

The correct option is A 80 J and 40 kg m s−1 Kinetic energy (K.E.)=12mv2 So, K.E.=12×10×42=80 J Momentum (P)=mv, where m is the mass and v is the velocity. P=10×4=40 kg m s−1

A body of mass $10 k g$ is moving with a velocity of $4 m s^{- 1}$ . Find the kinetic energy and momentum of the body respectively.

The correct option is A
$80 J$ and $40 k g m s^{- 1}$

Kinetic energy $(K . E .) = \frac{1}{2} m v^{2}$

So, $K . E . = \frac{1}{2} \times 10 \times 4^{2} = 80 J$

Momentum $(P) = m v$ , where $m$ is the mass and $v$ is the velocity.

$P = 10 \times 4 = 40 k g m s^{- 1}$