Can y’all help with number 2, 4,5,6?

2)Ek = 686.7[J]; 4)  see the explanation part; 5) B) Remained motionless; 6) P = 339 [watt]

Explanation:

2)

Using, the principle of energy conservation we can find the kinetic energy of the rock. We must bear in mind that the potential energy as the rock falls is becoming kinetic energy.

Now replacing the values:

4)

5)

B) Remained motionless

The reason is that work is defined as the product of force by distance, when there is no work for this case, it is because there is no movement of the object due to force.

6)

We recall that work is defined as the product of force by distance

W = F * d

W = 113 * 27

W = 3051[J]

And power is defined as the amount of work performed over a time interval.

Power = W/t

Power = 3051/9

Power = 339 [watt]

answer; ///(74) degrees is your answer..