Question

a person of mass 60 kg is in the lift .the change in apparent weight of the person ,when the lift moves with an acceleration 2 m/s and down with same acceleration is?

Answer 1

Answer:

720 N when lift goes up

480 N when lift goes down

Explanation:

Mass of the person m = 60kg

acceleration of the lift a = 2 m/s²

Taking acceleration due to gravity g = 10 m/s²

1) When the lift moves up with an acceleration a then the apparent weight of the person will increase

Apparent weight when lift moves up = m(g+a)

                                                             = 60 × (10+2)

                                                             = 720 N

1) When the lift moves down with an acceleration a then the apparent weight of the person will decrease

Apparent weight when lift moves up = m(g-a)

                                                             = 60 × (10-2)

                                                             = 480 N

Answer 2

Answer:

480 N when lift goes down

Explanation:

Mass of the person m = 60kg

acceleration of the lift a = 2 m/s²

Taking acceleration due to gravity g = 10 m/s²

1) When the lift moves up with an acceleration a then the apparent weight of the person will increase

Apparent weight when lift moves up = m(g+a)

                                                            = 60 × (10+2)

                                                            = 720 N

1) When the lift moves down with an acceleration a then the apparent weight of the person will decrease

Apparent weight when lift moves up = m(g-a)

                                                            = 60 × (10-2)

                                                            = 480 N