# Question #54082

##### 1 Answer

The height of the cliff is equal to **80 m**.

#### Explanation:

Your object is thrown from a cliff of unknown height. You know that the initial velocity of the object if equal to **15 m/s**, and that it takes the object **4 seconds** to hit the ground.

Despite the fact that the object's motion has a **horizontal component** as well, you'll only work with its **vertical component**.

The verical component of the initial velocity will be equal to **zero**. The vertical movement of the object will be influenced by the *gravitational acceleration*,

Plug in the value you ahve for