A particle of mass $100$ g is thrown vertically upwards with a speed of $5 m / s$ . The work done by the force of gravity during the time the particle goes up is

- 0.5

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- 1.25

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1.25

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0.5

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Solution

The correct option is B $- 1.25$ J
Work done by gravity will be negative times gain in potential energy.
So, potential energy is given by $m g h$ .
Using formula: $v^{2} = u^{2} + 2 a s$
$\Rightarrow 0 = 25 + 20 s$
$\Rightarrow s = 1.25$

So work done by the gravity will be $- m g h$
$= 0.1 \times 10 \times 1.25$
$= 1.25 J$

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A particle of mass 100g is thrown vertically upwards with a speed of 5m/s. The work done by the force of gravity during the time the particle goes up is

The correct option is B −1.25JWork done by gravity will be negative times gain in potential energy.So, potential energy is given by mgh.Using formula: v2=u2+2as⇒0=25+20s⇒s=1.25So work done by the gravity will be −mgh=0.1×10×1.25=1.25J

A particle of mass $100$ g is thrown vertically upwards with a speed of $5 m / s$ . The work done by the force of gravity during the time the particle goes up is