Map sapling learning Robert has just bought a new model rocket, and is trying to

Question

Map sapling learning Robert has just bought a new model rocket, and is trying to measure its flight characteristics. The rocket engine package claims that it will maintain a constant thrust of 12.3 N until the engine is used up. Robert launches the rocket on a windless day, so that it travels straight up, and uses his laser range-finder to meaure that the height of the rocket when the engine cuts off is 21.2 m. He also measures the rocket's peak height, which is 25.7 m. lf the rocket has a mass of 0.763 kg, how much work is done by the drag force on the rocket during its ascent? Number

Explanation / Answer

initial veleocity and final velocity is zero.

so, net workdone = 0

Net workdone = W_gravity + W_engine + W_drag

0 = W_gravity + W_engine + W_drag

so, W_drag = -W_gravity - W_engine

= -m*g*hmax*cos(180) - 12.3*21.2*cos(0)

= 0.763*9.8*25.7 - 12.3*21.2

= -68.6 J

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