A hiker accidentally knocks a rock off the edge of a steep cliff. Assuming there is no air… — Armed Services Vocational Aptitude Battery (ASVAB)

A hiker accidentally knocks a rock off the edge of a steep cliff. Assuming there is no air resistance and the acceleration due to gravity is $10\text{ m/s}^2$ , how fast is the rock traveling exactly $3$ seconds after it begins to fall?

Cevap: 30 m/s

Cevap

In free fall with no air resistance, an object's speed increases by the acceleration of gravity each second. After

3

seconds of accelerating at

10\text{ m/s}^2

, the speed is exactly

30\text{ m/s}

Adım Adım Çözüm

Identify the relevant formula

v = gt

The rock starts from rest, so its speed depends only on gravitational acceleration multiplied by the elapsed time.

Substitute the given values into the formula

v = 10 \times 3 = 30

Gravity accelerates the object by

10\text{ m/s}^2

for every second it falls.

Anahtar Kavram

Velocity of an object in free fall increases linearly with time based on gravitational acceleration.

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

Bu konudan daha fazla soru