Problem 25. Suppose a rocket is propelled up( assume it moves up in a straight l
ID: 1777422 • Letter: P
Question
Problem 25. Suppose a rocket is propelled up( assume it moves up in a straight line trajectory) from rest to a height 10m. At this height of 10 m the speed of the rocket is 10m/s. The mass of the rocket is 100kg. What is the work done by the rocket propulsion force( acting upwards)?( aslo assume no air drag / resistance is present)
a) 500J
b)-4800J
c)14800J
d) none of them.
41. Figure below shows the trajectory of a ball, after a collision, what will be the direction of the impulse? a) (b) (c) (dExplanation / Answer
from work energy theorem
w tot = kinetic energy
w g+wf = 1/2mv^2 = 1/2*100*10^2 = 5000
wf = 5000-100*9.8*10 = -4800 J
option b is the correct
41) impulse is the change in moemntum
here both y components are cancels and only x acomponents are reamining
so direction of impulse is laong the x axis
option c
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