Apperson A bail, hrown up in the air with an initial velocity of 392 m/s upward.

Question

Apperson A bail, hrown up in the air with an initial velocity of 392 m/s upward. How long does it take the ball to go up to hiphess A) 12.3 s B) 2s C) 2.88s D) 4.0 s E) 2.8 s 14. If Halley's comet takes 76 years to go around the Sun, what is its semimajor axis distance (average distance) in AU? A) 25.3 B) 17.9 C) 662.6D) 76 E) 8.7 15. An automobile traveling on a straight, level road at 30 km/h speeds up to 75 km/h in 50 s. What was the magnitude of the auto's acceleration, in meters per second squared? A) 98 m/s2 B) 25 m/s2 C) 0.25 m/s2 D) 35 m/s E) 80 m/s 16. A 0.065-kg bullet travels with a velocity of magnitude 90 km/h. What is the bullet's linear momentum? A) 4.8 kg-m/s in the opposite direction of the velocity B) 13 kg-m/s in the direction of the velocity C) 0.65 kg-m/s in the direction of the velocity D) E) 1.6 kg-m/s in the direction of the velocity 57 kg-m/s in the direction of the velocity A 4 kg roller coaster starts from rest 10 m above the ground. What is its velocity 5 meters above the ground in m/s? A) 9.9 B) 14 C) 25 D) 5 E) 7.5 How much heat is necessary to change 20 g of ice at-10°C into water at 20°C? A) 20 kcal B) 32 kcal C) 40 kcal D) 26.4 kcal E) 2.1 kcal ball is dropped from an upper-story dorm window. Neglecting air resistance, what is the speed of the bal whern it has fak n 39 m/s E) 3.9 m/s m d mie D

Explanation / Answer

13.

At highest point the final velocity will be zero.

V =0

Initial velocity u = 39.2 m/s

Acceleration due to gravity acts opposite to the velocity direction.

Consider eqaution of motion.

V = u - gt

0 = 39.2 -(9.81*t)

t = 39.2/9.81

= 4 seconds

Option (D) is correct.

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