Aball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. how long did it take the ball to reach the surface of earth? given: g = -9.8 meters/second2. a. 11.2 seconds b. 12.1 seconds c. 13.3 seconds d. 13.5 seconds e. 14.2 seconds

Answer

E. 14.2 seconds

Explanation

We are going to use the Newton's law of  motion.

s = ut + (1/2)gt²

Where s ⇒ height

            g ⇒ acceleration due to gravity

              t ⇒ time taken to reach the surface of the earth.

              u ⇒ initial velocity

s = ut + (1/2)gt²

1,000 = -10t + (1/2)×-9.8×t²

10t + (1/2)×9.8×t² = -1000

4.9t² + 10t = -1000

t² + 2.0408t = 204.0816

t² + 2.0408t + 1.0204² = 204.0816 + 1.0204²

(t + 1.0204)² = 205.1228

t = +√205.1228 -1.0204                   or t = -√205.1228 -1.0204

 = 14.322 s                                                     =  - 15.342 s

Since time can not be negative, we take the answer to be: 14.322 seconds.

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

get the total number of pieces of fruit and divide it by 4 to get the average. the result is the answer to the problem. 14 total number of fruits and there are 4 members. 14 divided by 4 is equals to 3.5.