Statement about ball thrown upwards

[chewchun]

Homework Statement

A ball is thrown vertically upwards and air resistance is NOT negligible.Which of the folloiwng statement is incorrect.
A:At maximum height,acceleration is zero.
B: Time taken for ball to travel upwards is shorter than time taken to travel down
C: Distance traveled for upward and downward motion are the same.
D: Magnitude of acceleration for the upward motion is always greater than 9.81ms-2

Homework Equations

The Attempt at a Solution

I choose A instantly as i knew there is acceleration downwards due to gravity.I was right though.
But i have no clue why D is correct?If a ball is facing air resistance wouldn't it slow down(Net force is pointing towards Earth)?

 

[SHISHKABOB]

so when the ball is going upwards, what are the forces acting on it

 

[chewchun]

so when the ball is going upwards, what are the forces acting on it

Downward:
Resistive force due to air resistance
Gravitational force due to gravity
Upward:
Zero?

 

[SHISHKABOB]

right, so if there's two forces in the downwards direction, and one of them is gravity, then what can we say about the total force acting on the ball

 

[chewchun]

right, so if there's two forces in the downwards direction, and one of them is gravity, then what can we say about the total force acting on the ball

Yes,but won"t it be that total downward force is larger than 9.81ms-2?
But Option D seems to imply that it is accelerating upward.

 

[SHISHKABOB]

Yes,but won"t it be that total downward force is larger than 9.81ms-2?
But Option D seems to imply that it is accelerating upward.

no it's just asking about the acceleration *during* the upward motion

 

[chewchun]

no it's just asking about the acceleration *during* the upward motion

So option D is saying,When it is traveling upwards,net force/acceleration is acting downwards but it's magnitude is larger than 9.81 due to presence of air resistance?

 

[SHISHKABOB]

that's what D appears to be saying, is that what you think is happening?