1. An athlete runs 100m in 10 seconds against a friction force of 100 N. What is her power output?

2. A weightlifter lifts an object of mass 30kg through a height of 2m in 3 seconds

What is the weight of the object? (take G as 9.8 N/kg)

What is her power output?

What is the work done on the object?

Pls help

increase masses, decrease separation

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.

snell's law

refractve index = sin incidence / sin refraction