## Question

junior college 2 | H1 Maths

Anyone can contribute an answer, even non-tutors.

##### Ainsley

chevron_right

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: 179

clear {{ downvoteCount * -1 }} Downvotes
1st
Date Posted: 1 year ago
Ainsley
1 year ago
I see......but how to use v-t graph to solve this question?
Mark Thong
1 year ago
clear {{ downvoteCount * -1 }} Downvotes
Reasoning using v-t graph
Date Posted: 1 year ago
clear {{ downvoteCount * -1 }} Downvotes
##### Jerlyyn Tay Geok Tin's answer
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.
Date Posted: 1 year ago