- #1

Trobocop

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i need to find the max height(Hmax) (when v=0) and the time(tmax) when the object reaches the max height by using newton's second law only.

(ignore the effect of air and air resistance to the object).

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- Thread starter Trobocop
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- #1

Trobocop

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i need to find the max height(Hmax) (when v=0) and the time(tmax) when the object reaches the max height by using newton's second law only.

(ignore the effect of air and air resistance to the object).

- #2

sjb-2812

- 445

- 5

i need to find the max height(Hmax) (when v=0) and the time(tmax) when the object reaches the max height by using newton's second law only.

(ignore the effect of air and air resistance to the object).

What equations do you know that may help here?

- #3

Trobocop

- 3

- 0

and F

so F=-F

but then the mass disappears so i am sure i'm doing this wrong, because the exercise tells me the mass of the object. i have to use it somehow

if i ignore this, i integrate the above equation then i put u=0 and i find tmax. then by using the equation of motion i find the max height. the numbers are correct because i tried it with energy equations but i am sure it's the wrong way.

- #4

sjb-2812

- 445

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- #5

Trobocop

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yes i know but the exercise says it clearly to use only newton's second law. that's why i'm stuck

- #6

sjb-2812

- 445

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