At t = 0 a 100gm ball is thrown upwards with initial speed `v_(0) = 2` m/s in an open platform elevator which at that time is moving downward with v =

Question

At t = 0 a 100gm ball is thrown upwards with initial speed `v_(0) = 2` m/s in an open platform elevator which at that time is moving downward with v =

At t = 0 a 100gm ball is thrown upwards with initial speed `v_(0) = 2` m/s in an open platform elevator which at that time is moving downward with v = 3 m/s and accelerating downward with an acceleration, `a = 3 m//s^(2)`. A drag force with magnitude `F_"DRAG"` = 0.8 N acts on the ball. Net force acting on the ball in the frame of the elevator just after it has been thrown is [`g =10 m//^(2)`] :
A. 1.2 N
B. 1.5 N
C. 1.8 N
D. 2.4 N

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
Elevator is non inertial frame of reference, therefore we must apply pseudo force.
Elevator is accelerating downwards, therefore pseudo force must act upwards while mg and `F_"DRAG"` act downwards.
`therefore F_"NET"` [downward] = mg -ma + `F_"DRAG"`
= 0.1 × 10 – 0.1 × 3 + 0.8 = 1.5 N.

4 views Answered 2023-02-05 15:29