5. Eliza starts from rest at the top of a 35 m hill, snowboards down a 30° incline into a valley, and continues up a 25 m hill. Both hill heights are measured from the valley floor. Assume you can neglect friction. a. How fast is Eliza snowboarding at the bottom of the valley?

b. What is Eliza’s speed at the top of the next hill?

not moving. pos accel,

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.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

where is the