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?

Answer 1

HEY MISS.!!!

HERE'S THE ANSWER..

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♠️ We know weight is also a force which we exert on ground , ( weight = mass × acc. due to gravity ( g ) .

♠️ First we'll calculate total force exerted on ground by boy with bag.

♠️ If we are calculating weight then , force is product of mass and acc. due to gravity .

=> F = m . g

=> F = 60 × 10 // g = 10 m / s^2

=> F = 600 N ( downward )

✔️ Total force exerted on ground by boy and bag ( 600 N + 40 N = 640 N )

▶️ Now According to Newton's third law " Ever action has a equal reaction "

✔️ So the ground will exert equal force on boy , 640 N in upward direction...

HOPE HELPED..

JAI HIND..

:)

Answer 2

Force = m × g

force = 60 × 10

force = 600 N

total force = 600 + 40

ground will exert equal force of boy

F = 640 N