Which statement about types of waves and energy is correct? A. Electromagnetic waves can transmit energy; mechanical waves cannot.
B. Mechanical waves can transmit energy; electromagnetic waves cannot.
C. Neither mechanical nor electromagnetic waves can transmit energy.
D. Both mechanical and electromagnetic waves transmit energy.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

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.

gravitational energy

electrical energy

kinetic energy

ligh energy