Acannon ball fired horizontally from a cliff has a velocity directed at 60 degrees above horizontal when it hits the ground 3.0 seconds later. how high is the cliff

44.1 m

Explanation:

The canon ball is fired horizontally. Hence, the initial velocity in vertical direction, u=0.

It takes 3.0 s for the ball to hit the ground. t=3.0 s

the ball would experience acceleration due to gravity i.e. a=g=9.8 m/s²

The vertical distance covered = height of the cliff.

Using the equation of motion,

Hence, the height of the cliff is 44.1 m.

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)