A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32 m below the height from which it was thrown. How long does it take the dart to hit the board? Round your answer to the nearest hundredth of a second (before square rooting, keep 4 places past the decimal point)

Explanation:

It is given that,

The horizontal speed of a dart player = 12.4 m/s

The dart hits the board 0.32 m below the height from which it was thrown.

We need to find how long it take the dart to hit the board.

Let the time taken by the dart to hit the board. Using second equation of motion to find it.

Let x be the horizontal distance travelled. It is calculated as follows :

So, the dart will hit the board at a distance of 3.16 m.

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.