A fire hose held near the ground shoots water at a speed of 6.8 m/s. At what angle(s) should the nozzle point in order that the water land 2.5 m away

So, based on the angle values that have been found, the angle of elevation of the nozzle can be 16° or 74°.

Hi ! This question can be solved using the principle of parabolic motion. Remember ! When the object is moving parabolic, the object has two points, namely the highest point (where the resultant velocity is 0 m/s in a very short time) and the farthest point (has the resultant velocity equal to the initial velocity). At the farthest distance, the object will move with the following equation :

With the following condition :

We know that :

Step by Step :

First Probability

→ (T)

→ (F)

Second Probability

→ (T)

→ (F)

So, based on the angle values that have been found, the angle of elevation of the nozzle can be 16° or 74°.

d is the correct answer

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle