Are you allowed to quote the formula for the equation of the trajectory in the exam or do you have to derive it every time? y=xtanθ−2u2x2gsec2θ The old textbook I have quotes it for most problems but the Edexcel textbooks barely use it.
Are you allowed to quote the formula for the equation of the trajectory in the exam or do you have to derive it every time? y=xtanθ−2u2x2gsec2θ The old textbook I have quotes it for most problems but the Edexcel textbooks barely use it.
You'd have to derive it if it's not in the formula booklet.
Are you allowed to quote the formula for the equation of the trajectory in the exam or do you have to derive it every time? y=xtanθ−2u2x2gsec2θ The old textbook I have quotes it for most problems but the Edexcel textbooks barely use it.
If Edexcel questions need it, they generally ask you to derive it.
Otherwise, you can quote it, but if so, please make sure that you've got it correct. An incorrect formula would mean that you'd lose all of the marks.
If that were the case, then presumably you would also have to derive v^2 = u^2 + 2as every time you used it.
It is that case.
You're expected to remember SUVAT equations and you're free to use them as they're on the spec, and they're the basis of Mechanics 2. That is not the case with the projectile one.
You're expected to remember SUVAT equations and you're free to use them as they're on the spec, and they're the basis of Mechanics 2. That is not the case with the projectile one.
What an absurdly specific formula to memorise. I despair.
It is occasionally useful, particularly if the angle of projection is unknown. If it is needed, Edexcel will generally ask you to derive it,as in June 2011. To do this you use s = ut horizontally and s = ut + 0.5at^2 vertically and then eliminate t.