# science

an object accelerates (cahnges its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT

a) a ball striking a wall, in which the force of the ball on the wall is equal to the force of the wall on the ball
b) a gas balloon in which the buoyant force is greater than its weight and air resistance
c) a man in a parachute when the air resistance is less than his weight
d) a rocket fired straigt up, when the engine thrust is equal to the air resistance
e) an airplane in horizontal flight when the thrust of the engine is equal to the drag of the air

1. 👍 0
2. 👎 0
3. 👁 159
1. This has been posted by you several times. An answer has been provided elsewhere.

1. 👍 0
2. 👎 0

## Similar Questions

An object with an initial speed of 4.0 meters per second accelerates uniformly at 2.0 meters per second2 in the direction of its motion for a distance of 5.0 meters. What is the final speed of the object? Vi=4m/s a=2.0m/s*s d=5.0m

2. ### physics

two forces of 62N and 95N are acting on an object at an angle of30 degree and 60 degree from horizontal in opposite direction . find out total force experienced by the object in horizontal and vertical planes?

3. ### Physics

Two forces are applied to a block of mass MM=12.0 kg that sits on a horizontal, frictionless table. One force F⃗ 1F→1 has a magnitude of 10.0 N and is directed at an angle θ1 equal to 37.0° from the xx direction as labeled

4. ### science

two forces,80N and 100N acting at an angle of 60° with each other,pull on an object what single force would replace the two forces

1. ### physics

An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a positive magnitude of 6.7N; a second force has a magnitude of 4.6 N and points in the

2. ### physics

Three forces acting on an object are given by F1 = ( - 1.85i + 2.50j) N, F2 = ( - 5.10i + 3.25j ) N, and F3 = ( - 45.0i + 48.0j ) N. The object experiences an acceleration of magnitude 3.75 m/s2. (a) What is the direction of the

3. ### Physical Science

A distance-time graph indicates than an object moves 100 m in 4 s and then remains at rest for 6 s. What is the average speed of the object? A. 50 m/s B. 25 m/s** C. 10 m/s D. 100 m/s Which example identifies a change in motion

4. ### Physics

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.16 105 m/s to a final velocity of +2.23 106 m/s while

1. ### Science- Brady, 2 more!

#1. Which statement is true about the image below? 7 N -> |rectangle| |square| 5 N -> |square| •0 N •5 N •10 N (?CORRECT?, MY ANSWER) •25 N

2. ### physics

An object acted on by three forces moves with constant velocity. one force acting on the object is in the positive x direction and has magnitude of 6.5 N, a second force has a magnitude of 4.4 N and points in the negative

3. ### Math

Find the resultant in magnitude and direction of forces 10N, 20N, 30N, 40N, acting respectively in the direction 60,120,180 and 270. I tried drawing out the forces with the respective angles but the angles are more than

4. ### Physics

Two forces F1 and F2 act on ab object. It accelerates in a particular direction. Under what circumstances can you predict the direction of force F1 regardless of the specific value of Force F2? My ans: When F2 is weight but I am