1. A 50 kg roller coaster car is launched, from ground level, at 20 m/s. How fast will it be moving when it reaches the top of a loop, which is 12 m above the ground? 2. A 200 g model rocket is observed to rise 100 m above the ground after launch. What must have been the launch speed of the rocket at the ground?

3. (This one’s a toughie) A 10 kg monkey swings on a vine from a point which is 40 m above the jungle floor to a point which is 15 m above the floor. If the monkey was moving at 2 m/s initially, what will be his speed at the 15 m point?

(Word document is linked below for more context)

root word, prefixes, and suffixes

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000