Physics
posted by mw on .
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?

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.)