# Physics

posted by .

An object with a mass of 49 N falls out of a plane going 20.0 m/s at 300 m above the ground.

1)How do I find the time that the object is in the air?

2)The horizontal distance of the object?

Could someone help me out?

• Physics -

N means Newtons and is FORCE, in this case of gravity (the "weight").
The mass is in KILOGRAMS
and the force 49 N = m g = m (9.8) approximately on earth.
HOWEVER - luckily in this problem all of that matters not at all. It does not matter what the mass or weight is at all. It accelerates downward at 9.8 m/s^2 and keeps going at 20 m/s horizontally.
distance down = (1/2)(9.8) t^2
300 = 4.9 t^2
t = 7.82 seconds in the air
now multiply that by 20.0 m/s to find the horizontal distance.
(Notice that the bomb hits right under the plane if the plane keeps going at 20 m/s straight. Always bank and climb after dropping bombs.)

## Similar Questions

1. ### Physics

a) Newton's law of motion states that the acceleration acting on a falling body (assuming no other forces) is  x" = -g, where x(t) is the height of the object above the ground, t is time, and g is the gravitational constant. Find …
2. ### Physics

a) Newton's law of motion states that the acceleration acting on a falling body (assuming no other forces) is  x" = -g, where x(t) is the height of the object above the ground, t is time, and g is the gravitational constant. Find …
3. ### Physics

You lean over the edge of a building that is 106 meters above the ground and throw an object straight upwards. This object takes 3 seconds to reach its maximum vertical displacement above your hand and then falls to the ground. From …
4. ### physics

I post this early ; but didn't understand the answer.. a 3-kg object falls from a height of 10m to the ground. The work done by air resistance ia 20 J. What is the kinetic energy of the object as it hits the ground..
5. ### Physics

A plane flying in a straight line at constant altitude of 2000 m above the ground with a speed of 200m/s drops an object. Explain how the velocity of the object is actually affected by air resistance. Show how the resistivity force …
6. ### Physics

An object with mass 8.5kg is moving vertically upward with a velocity if 35m/s at a height of 100m above the ground. Find the time the object takes to reach the ground Thanks!!
7. ### Physics

One object is thrown straight up at 54.9 m/s from the ground at the base of a building with is 157.9 meters tall. At the same time the object is thrown up at the bottom of the building, another object is thrown straight down at the …
8. ### Physics

An object is launched at an angle of 24 degrees above the horizontal at a velocity of 33.7 m/s from the top of a building which is 110.8 meters above the ground. When the object lands on the ground, what is the horizontal displacement …
9. ### Algebra 2

An object is dropped from a small plane. As the object falls, its distance, d, above the ground after t seconds, is given by the formula d = –16t2 + 1,000. Which inequality can be used to find the interval of time taken by the object …
10. ### Physics

An object of mass m1 is placed on an inclined plane (angle theta above the horizontal) is connected by a string going over a pulley to a hanging object of mass m2. Determine the acceleration of the system if there is no friction between …

More Similar Questions