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Grade 8th Geography. Local Time and Standard Time. please give an explanation on HOW to solve this answer and not just the answers. |
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Answer» Answer: Although a relatively SIMPLE PROBLEM, this is another one of those dreaded “2-part” problems that baffle many students. We will choose one of Newton’s equations of motion shown below: S=Vit+12at2S=Vit+12at2 ————--equation 1 Vf=Vi+atVf=Vi+at —————equation 2 combine equation 1 and equation 2 to eliminate “t” gives V2f−V2i=2aSVf2−Vi2=2aS —————equation 3 The problem asks for speed after a given DISTANCE, so you would choose either equation 1 or equation 3 since they both have distance ( SS ) in the equation. But since we don’t know the travel time, let’s choose equation 3: V2f−V2i=2aSVf2−Vi2=2aS Before we can solve this equation, we first need to calculate the ACCELERATION. This is why I call this a 2-part problem. F=maF=ma or a=Fm=1200N5kg=1200kg⋅ms25kg=240ms2a=Fm=1200N5kg=1200kg⋅ms25kg=240ms2 equation 3: V2f−V2i=2aSVf2−Vi2=2aS V2f−0=2(240)(5)Vf2−0=2(240)(5) Vf=49.0msVf=49.0ms |
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