Question

Calculate the work done by a boy in lifting a 5kg box from the ground and keeping it on the shelf
1.5 m high( g= 10ms-2)

Answer 1

Given :-

• Mass of the box, m = 5 kg
• gravitational acceleration, g = 10 m/s²
• Displacement, s = 1.5 m

To Find :-

• work done by boy in lifting the box ?

Solution :-

we know that,

$\boxed{ \bold{force = mass \times acceleration}} \\ \\ \bold{: \implies 5 \times 10} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \bold{: \implies 50 \: N} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

so, force of 50 N is required for lifting the box

now,

$\underline{ \boxed{ \bold{work = force \times displacement}}}$

$\bold{: \implies 50 \times 1.5 } \\ \\ \bold{: \implies 75 \: J} \: \: \: \: \: \: \: \:$

hence, work done by the boy to lifting the box is 75 Joules