secure | https://session.masteringphysi Ch 03 HW Part2 Problem 3.99 MasteringPhy

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secure | https://session.masteringphysi Ch 03 HW Part2 Problem 3.99 MasteringPhysics: Ch 03 HW Part 2 itemView?assignmentProblemID-78596345 previous 2 of 10 I next Problem 3.99 Part A A theorist has predicted that certain forms of matter exhibit a gravitational repulsion. On a of this matter, the "antigravitational acceleration points upward, away from the planet's surface, and any object released near the ground moves not in free-fall motion but rather in free-rise motion. Suppose that on this planet, a projectile launched downward from a cliff at an initial speed of 20 m/s is observed 11 s later moving upward at 40 m/s What is the free-rise acceleration on this planet? Express your answer with the appropriate units. Enter positive value if the acceleration is upward and negative value if the acceleration is downward. a Value Units Submit My Answers Give Up Part B At what instant after launch is the projectile's speed zero? Express your answer with the appropriate units. tValue Units Submit My Answers Give Up CA

Explanation / Answer

Part-A:

Let the free rise acceleration be g(upwards)

initial velocity, u = 20 m/s(downward)

time,t= 11 seconds

final velocity, v = 40m/s (upwards)

from kinematics equation,

v=u+gt

40=-20+g*11

g= 60/11 m/s^2

g= 5.45 m/s^2 Answer

Part B:

Now the final velocity,v=0

v=u+gt

0=-20+60/11t

t=11/3 seconds

t=3.67 seconds Answer

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