(Note: this question is from an old question paper how else would i get mark scheme. So pls look properly before rejecting)Since impulse( change in momentum) is mv - mu mv=0 mu=1400 shouldnt impulse be 0-1400 ? So answer should be negative right? Why does markscheme show positive answer QuestionAnswer(momentum =) mv OR 70 x 20= 1400 kg m/s OR Ns1(a)(i)a)(ii)same numerical answer as (a)(i) with either unit OR 1400kgm/s 1 Fig. 2.1 shows a dummy of mass 70 kg used in a crash test to investigate the safety of a nevpassengerdummybarrier-compartmentwindscreenFig. 2.1The car approaches a solid barrier at 20 m/s. It crashes into the barrier and stops suddenly.(a)(i) Calculate the momentum of the dummy immediately before the crash.momentum =(ii) Determine the impulse that must be applied to the dummy to bring it to rest.impulse =

Note that, by the definition impulse=change in momentum, we mean the impulse experienced by the…

Answered: Since impulse( change in momentum) is…

College Physics

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ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

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(Note: this question is from an old question paper how else would i get mark scheme. So pls look properly before rejecting)

Since impulse( change in momentum) is mv - mu mv=0 mu=1400 shouldnt impulse be 0-1400 ? So answer should be negative right? Why does markscheme show positive answer

Question
Answer
(momentum =) mv OR 70 x 20
= 1400 kg m/s OR Ns
1(a)(i)
a)(ii)
same numerical answer as (a)(i) with either unit OR 1400kgm/s

1 Fig. 2.1 shows a dummy of mass 70 kg used in a crash test to investigate the safety of a nev
passenger
dummy
barrier-
compartment
windscreen
Fig. 2.1
The car approaches a solid barrier at 20 m/s. It crashes into the barrier and stops suddenly.
(a)
(i) Calculate the momentum of the dummy immediately before the crash.
momentum =
(ii) Determine the impulse that must be applied to the dummy to bring it to rest.
impulse =

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