Answer
70 m/s, 140 m/s, 28 m/s²
Explanation:
Average velocity = total distance travel / time = 350 / 5 = 70 m/s
average velocity = (initial velocity + final velocity) / 2
70 × 2 = 140 m/s
change in velocity = final velocity - initial velocity = 140 m/s - 0 = 140 m/s
acceleration = (final velocity - initial velocity) / t = 140 m/s / 5 = 28 m/s²
Answer:
The magnitude of the acceleration of the elevator is 0.422 m/s²
Explanation:
Lets explain how to solve the problem
Due to Newton's Law ∑ Forces in direction of motion is equal to mass
multiplied by the acceleration
We have here two forces 460 N in direction of motion and the weight
of the person in opposite direction of motion
The weight of the person is his mass multiplied by the acceleration of
gravity
→ W = mg , where m is the mass and g is the acceleration of gravity
→ m = 45 kg and g = 9.8 m/s²
Substitute these values in the rule above
→ W = 45 × 9.8 = 441 N
The scale reads 460 N
→ F = 460 N , W = 441 N , m = 45 kg
→ F - W = ma
→ 460 - 441 = 45 a
→ 19 = 45 a
Divide both sides by 45
→ a = 0.422 m/s²
<em>The magnitude of the acceleration of the elevator is 0.422 m/s²</em>
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