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A two-stage missile is fired vertically from rest with acceleration as shown in the graph. In 15 sec, the first stage, A, burns out and the second stage, B, ignites. How fast is the missile moving and how far has it gone at t = 20 sec.
A) v = 360 m/s; s = 3.60 km
B) v = 430 m/s; s = 4.30 km
C) v = 500 m/s; s = 5.00 km
D) v = 395 m/s; s = 3.69 km
A cylinder with moment of inertia 18.8 kg m2 rotates with angular velocity 7.85 rad/s on a frictionless vertical axle. Show that energy is lost in this situation by calculating the ratio of the final to the initial kinetic energy
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