Q6. A rocket of mass m is projected vertically upwards with an initial velocity u from the ground. The rocket is subject to a resistive force of 4.905mv Newtons where v is the velocity of the rocket when it is x metres above the ground. (a) Derive a differential equation of the motion for the rocket, in the form: dv = -D(E +v) dx Where D and E are constants to be found. (b) Solve the differential equation and express x = f (v). (c) If u = 10 m/s find the greatest height the rocket reaches above ground.

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Q6. A rocket of mass m is projected vertically upwards with an initial velocity u from the ground. The rocket
is subject to a resistive force of 4.905mv Newtons where v is the velocity of the rocket when it is x metres
above the ground.
(a) Derive a differential equation of the motion for the rocket, in the form:
dv
= -D(E +v)
dx
Where D and E are constants to be found.
(b) Solve the differential equation and express x = f(v).
(c) If u = 10 m/s find the greatest height the rocket reaches above ground.
Transcribed Image Text:Q6. A rocket of mass m is projected vertically upwards with an initial velocity u from the ground. The rocket is subject to a resistive force of 4.905mv Newtons where v is the velocity of the rocket when it is x metres above the ground. (a) Derive a differential equation of the motion for the rocket, in the form: dv = -D(E +v) dx Where D and E are constants to be found. (b) Solve the differential equation and express x = f(v). (c) If u = 10 m/s find the greatest height the rocket reaches above ground.
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