Is it Possible for o system to hove negative potentiel energy) Yes. as long as t

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Is it Possible for o system to hove negative potentiel energy) Yes. as long as the kinetic energy is positive Yes. as long as the total energy is positive. Yes, Since the choice of the zero of potential energy is arbitrary No. because the kinetic energy of a system must equal its potential energy No. because this would have no physical meaning A stationary shell explodes into two fragments one fragment 25 times heaver than other. The fragments travel in opposite directions lower. then the momentum change of the lighter fragment is 25 times as great as the momentum change of the heavier fragment. the momentum change of the heavier fragment is 25 times as great as the moment a change of the lighter fragment. the momentum change of the lighter fragment is exactly the same cs the momentum change of the heavier fragment. the kinetic energy change of the heavier fragment is 25 times as great as the kinetic energy change of the lighter fragment the kinetic energy change of the lighter fragment is 25 times as great as the kinetic energy change of the heavier fragment A 1000.0 kg car is moving at 15 km/h. If a 2000.0 kg truck has 18 times the kinetic energy of the cor, how fast is the truck moving 75 km/h 63 km/h 45 km/h 36 km/h 54 km/h A baseball is thrown vertically upward and feels no air resistance As it is rising both its momentum and its mechanical energy are conserved its momentum is not conserved, but its mechanical energy is conserved. both its momentum and its kinetic energy are conserved) its kinetic energy is conserved, but its momentum is not conserved. its gravitational potential energy is not conserved, buts its momentum is conserved A golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/$ immediately after being struck If the club and boll were m contact for 0 81 ms. what is the average force exerted on the balP 4.9 kN) 7.1 kN 5.5 kN) 6 3 UN

Explanation / Answer

1.C) Yes, since the choice of zero P.E. is just arbitrary.

2. C) As the total momentum of system is conserved in absence of external force.

3. C) kinetic energy of car= mv^2/2 =1000*15^2/2= 56250J

velocity of truck= sqrt( 2*18*56250/2000)= 45 m/s

4. B) momentum conserved only in absence of external force, but gravity can't be neglected.

5. D) Force=Impulse/time = mass*velocity/time

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