Engineering Board Exam Reviewer · Engineering Mechanics · medium
An object is dropped from rest from a height of 29 m. Neglecting air resistance, how long does it take to hit the ground? (g = 9.81 m/s2)
- 2.96
- 1.72
- 2.43
- 4.86
Answer
C. 2.43
Solution
Using h = 1/2gt2: t = sqrt(2h/g) = sqrt(2(29)/9.81) = 2.43 s.
More Engineering Mechanics questions
- A particle starts with an initial velocity of 7 m/s and a constant acceleration of 3 m/s2. What distance does it travel in 7 seconds?
- A car starts with an initial velocity of 8 m/s and accelerates uniformly at 5 m/s2 for 6 seconds. What is its final velocity?
- A projectile is launched with an initial speed of 24 m/s at an angle of 35° above the horizontal. Neglecting air resistance, what is its…
- An object is dropped from rest from a height of 26 m. Neglecting air resistance, how long does it take to hit the ground? (g = 9.81 m/s2)
- A particle starts with an initial velocity of 6 m/s and a constant acceleration of 2.5 m/s2. What distance does it travel in 6 seconds?
- A car starts with an initial velocity of 7 m/s and accelerates uniformly at 4 m/s2 for 5 seconds. What is its final velocity?
- A projectile is launched with an initial speed of 22 m/s at an angle of 30° above the horizontal. Neglecting air resistance, what is its…
- An object is dropped from rest from a height of 23 m. Neglecting air resistance, how long does it take to hit the ground? (g = 9.81 m/s2)
- A particle starts with an initial velocity of 5 m/s and a constant acceleration of 2 m/s2. What distance does it travel in 5 seconds?
- A car starts with an initial velocity of 6 m/s and accelerates uniformly at 3 m/s2 for 4 seconds. What is its final velocity?