Question

man of mass 50 kg on the top floor of a skyscraper steps into an elevator what is the man's weight as the elevator accelerates downwards @ 1.5 metre per second square

​

Answer 1

Answer:

Newton's laws of motion

Explanation:

★ Given ;

» Mass of man ( m ) = 50 kg

» Acceleration of lift ( downwards ) = 1.5 m / s²

★ Weight of man ( W ) = ???

★ We know that ;

While accelerating downwards ;

W = M ( g - a )

» W = 50 ( 10 - 1.5 )

» W = 50 ( 8.5 )

» W = 425 N

ANSWER :- HENCE ; Weight of Man is 425 N or 42.5 g .

Answer 2

GiveN :

• Mass of Man (M) = 50 kg
• acceleration (a) = 1.5 m/s²

To FinD :

• Weight of man if elevator is accelerated downwards

SolutioN :

As we know that for an elevator accelerating downwards, the weight of object (W) is :

$\dashrightarrow {\boxed{\tt{W \: = \: M(g \: - \: a)}}} \\ \\ \dashrightarrow \tt{W \: = \: 50( 10 \: - \: 1.5)} \\ \\ \dashrightarrow \tt{W \: = \: 50(8.5)} \\ \\ \dashrightarrow \tt{W \: = \: 425} \\ \\ \underline{\sf{\therefore \: Weight \: of \: man \: is \: 425 \: N}}$

____________________

Additional information

• Acceleration is defined as rate of change of velocity.

• It's SI unit is m/s².

• It is denoted by “a”.

• It is a vector quantity.