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# Edexcel M2 - basic work & energy question (slight confusion) Watch

1. A particle of mass 14kg is projected vertically upwards from ground level with a speed of 17ms?1. It comes to instantaneous rest at a height of 7m above the ground. As the particle moves it is subject to air resistance of constant magnitude R newtons. Using the work-energy principle, or otherwise, find the value of R.

do you assume that the total air resistance is 7R? because that's what they have wrote in the solution
2. bump *****es
3. The change in an objects kinetic energy + potential energy is equal to the resistive force (excluding deacceleration due to gravity) multiplied by distance travelled:

4. (Original post by chaz1992)
The change in an objects kinetic energy + potential energy is equal to the resistive force (excluding deacceleration due to gravity) multiplied by distance travelled
Sorry this is a bit late, but do you mean
The change in an objects kinetic energy - potential energy is equal to the resistive force
and not + potential energy?
5. (Original post by verdhy)
Sorry this is a bit late, but do you mean
The change in an objects kinetic energy - potential energy is equal to the resistive force
and not + potential energy?
change in an objects (kinetic energy + potential energy) = work done

0.5m(v^2-u^2) + mg(h2 - h1) = Work Done; where v is the velocity at h2 and u is the velocity at h1.

so Change in energy at point A - change in energy at point B = work done.

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