Question

A man of mass 60 kg stands on weighing machine in a lift which is moving down
and speeding up with an acceleration of 2.3 m/s? What will be reading on the
weighing machine scale? (g = 9.8 m/s)​

Answer 1

Answer:

13.8 kg

Explanation:

the force exerted will be 138 N therefore the amss is 13.8 kg

Answer 2

Answer:

Ans:- 45.87 Kg or 450 newton

Explanation:

Mass of the man = m = 60 kg

Acceleration, a =2.3 m/s² downward

Using Newton's second law of motion, we can write the equation of motion as:

R + m(g↓) = m(a↓)

Applying the sign convention i.e downward acceleration is 'Negative' we get

R + m(-g) = m(-a)

by rearranging the above equation we get

R = m(g - a)

R = 60 (9.8-2.3) = 60 x 7.5

= 450 N

Therefore, reading on the weighing scale

$m_{new}=\frac{450}{g}=\frac{450}{9.8}=45.87 Kg$

#SPJ2