The free-body diagram of a crate is shown.
2 answers:
The net force acting on the crate is the sum of all the forces acting in the different directions on the crate, which is 176N to the left.
- Upward force = 440 N
- Downward force = - 440N
- Rightward force = 176 N
- Leftward Force = - 352N
<u>The net vertical force acting on the crate</u> :
- Upward force + Downward force
- 440N + (-440N) = 0 N
<u>The net horizontal force acting on the crate</u> :
- Rightward force + Leftward force
- 176 N + (- 352 N) = - 176N
<u>The total net force acting on the crate</u> :
- Vertical + horizontal force
- 0 + (-176 N) = - 176 N
Therefore, the net force acting on the crate is - 176 N, which is 176 N to the left.
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Explanation:
average speed = total distance travelled / total time travelled
time to travel the first 6km: 6 / 50 = 3/25 (h)
time to travel the next 6km: 6 / 90 = 1/15 (h)
[I think there's problem in the question 'cause 900km/h sounds impossible for normal person to travel in normal condition]
The total time: 3/25 + 1/15 = 14/75 (h)
Average speed over the 12 km drive will be: