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junior college 2 | H1 Maths
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Ainsley
Ainsley

junior college 2 chevron_right H1 Maths

PHYSICS.
I don't understand why the answer isn't 1.0s ,and the answer at the back is negative 2s.
Thank you very much.

Date Posted: 1 year ago
Views: 142

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Mark Thong
Mark Thong's answer
122 answers (Tutor Details)
1st
Ainsley
Ainsley
1 year ago
I see......but how to use v-t graph to solve this question?
Mark Thong
Mark Thong
1 year ago
I ve added an answer using v-t graph..
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Mark Thong
Mark Thong's answer
122 answers (Tutor Details)
Reasoning using v-t graph
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Jerlyyn Tay Geok Tin
Jerlyyn Tay Geok Tin's answer
10 answers (Tutor Details)
Firstly, time does not have a direction. So '-2seconds' is wrong. Time must be a positive real number

Secondly the trajectory of the ball in the diagram is wrong, it is 'thrown upwards from distance 10m from ground' so the movement would be in my diagram as drawn.

To solve such questions you would need to solve a first path (upwards to an instantaneous stop) then a second path (downwards towards the ground). Total time taken will be 2s.
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Jerlyyn Tay Geok Tin
Jerlyyn Tay Geok Tin's answer
10 answers (Tutor Details)
Oh or alternatively you can pluck into this simple eqn and use the correct signs by designation a direction as positive
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Ainsley
Ainsley's answer
16 answers (A Helpful Person)
Can I solve this question by using this method? Firstly, calculate the time taken to reach max height.Secondly, calculate the time taken to reach the floor.Then adding to answer together.If my concept is wrong please tell me.Thank u very much.