Asled with no initial velocity accelerates at rate of 5.0 m/s^2 down a hill . how long does it take the sled to go 45 m to the bottom

The time taken by the sled to reach 45 m to the bottom is 4.24 s.

The sled's initial velocity u is zero. It has an acceleration a of a value 5 m/s² down the hill and it travels a distance s equal to 45 m down the hill.

Use the equation of motion,

Substitute 0 m/s for u and rewrite the equation for t.

The sled takes a time of 4.24 s to reach the bottom of the hill

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

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.