Question

A boy having a mass of 60 kg holds in hands a school bag of weight 40 N . With what force the floor will push up on his feet? plz answer with steps​

Answer 1

AnswEr :

The force of the floor will push up on his feet = 640 N.

Explanation :

We are given with the mass of a boy as well as weight of a school bag, that is,

• Mass of a boy = 60 kg.
• Weight of a school bag = 40 N.

We have to find out the force of the floor will push up on his feet.

We know that weight is also a force which we exert on ground, such that,

Weight = Mass × Acceleration due to gravity..

And we also know the value of acceleration due to gravity, that is,

Acceleration due to gravity, g = 10 m/².

Now,

As we are given with the mass of a boy and acceleration due to gravity we know the required formula, that is,

⟶ F = mg.

Substituting the given values in the formula,

⇒ F = 60 × 10

⇒ F = 600

Now,

Total force exerted on ground by a boy,

⇒ F = 600 + 40

⇒ F = 640

Hence, force of the floor will push up on his feet is 640 N.

Answer 2

$\huge\mathcal{\mid{\mid{\underline{\pink{Good\:Morning\:}}}{\mid{\mid}}}}$

Qᴜᴇsᴛɪᴏɴ ;-

❥︎ A boy having a mass of 60 kg holds in hands a school bag of weight 40 N . With what force the floor will push up on his feet?

$\huge{\orange{\boxed{\fcolorbox{lime}{indigo}{\color{aqua}ANSWER}}}}$

$\bf\green{Total\: force\: acting\:on\:boy\:bag\: system\:is\:given\:by\:,}$

$\pink\longmapsto\:\bf\blue{F\:=\: Weight\: of\:boy\:+\: Weight\: of\:bag\:}$

$\Large\bf\pink{Where,}$

• $\bf\red{Weight\: of\:boy}$ = 60kg × 10m/s² = 600 N

• $\bf\red{Weight\: of\:bag}$ = 40 N

$\longmapsto\:\sf{F\:=\:600\:N\:+\:40\:N\:}$

$\longmapsto\:\bf\orange{F\:=\:640\:N\:}$

$\Large\bf\red\checkmark$ From Newton's Third Law, to every action there is an equal and opposite reaction.

$\Large\bf\therefore$ The floor will push on his feet with a force of 640 N.