Determine the initial velocity of a marble that lands 1.8m away from a tabletop that is 0.8m from the ground. Acceleration due to gravity = 9.85
0 2.25 m/s
2.6 m/s
0 1.8 m/s
4.5 m/s

4.5 m/s

Explanation:

= Horizontal displacement = 1.8 m

= Vertical displacement = 0.8 m

= Horizontal velocity

g = Acceleration due to gravity =

t = Time taken to fall down

The initial velocity of the marble is 4.5 m/s.

i think the answer is a and b

i wish you luck

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.