physics
posted by john .
On planet Seeturn, the free fall acceleration is 9.800 N/kg but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 micro C (5.00*106) is thrown upward at a speed of 20.1 m/s, and it hits the ground after an interval of 4.10s. What is the potential difference between the starting point and the top point of the trajectory?

What is the kinetic energy at the bottom?
Ke = (1/2) m v^2 = .5 * 2 * 20.1^2
What is the average speed going up?
Vav = 20.1 / 2 = 10.05 m/s
So how long did it take to go up?
t = 4.1/2 = 2.05 seconds upward
so how high did it go?
h = 10.05 * 2.05
so how much work did gravity do on the way up?
Wg = m g h = 2*9.8* h
so how much was used to climb the voltage potential
Ke  Wg
but we all know that is the charge times the voltage (the potential difference)
Q V = Ke Wg 
Bob Pursley already did this for you.

What would be the final answer and what would be the value of Q

5.00 micro C (5.00*106)
is Q, the charge. It is GIVEN.
No, you do it. 
With your way, the answer is 50000 V but that is not the correct answer.
Respond to this Question
Similar Questions

Physics
A ball is shot vertically upward from the surface of another planet. A plot of y versus t for the ball is shown in the figure below, where y is the height of the ball above its starting point and t = 0 at the instance the ball is shot. … 
physics
Planet Z is 1.00×10^4 km in diameter. The freefall acceleration on Planet Z is 10.0 m/s^2. a)What is the mass of Planet Z? 
physics
On planet Tehar, the acceleration of gravity is the same as that on Earth but there is also a strong downward electric field with the field being uniform close to the planet's surface. A 2.16 kg ball having a charge of 4.80 uC is thrown … 
earth
On planet Tehar, the freefall acceleration is the same as that on Earth but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 µC is thrown upward … 
earth
On planet Tehar, the free fall acceleration is the same as that on the Earth, but there is also a strong downward electric field that is uniform close to the planets surface. A 2.00k ball having a charge of 5.00C is thrown upward at … 
physics
A tennis ball is shot vertically upward from the surface of an atmospherefree planet with an initial speed of 20.0 m/s. One second later, the ball has an instantaneous velocity in the upward direction of 15.0 m/s. What is the magnitude … 
physics
On planet x, an object weighs 10.4N. On planet B where the magnitude of the free fall acceleration is 1.48g (where g=9.8 m/s^2 is the gravitational acceleration on Earth),the object weighs 24.6N. The acceleration of gravity is 9.8 … 
Physics
The freefall acceleration at the surface of planet 1 is 18 m/s^2. The radius and the mass of planet 2 are twice those of planet 1. What is the freefall acceleration on planet 2? 
physics....
Spherical planet A has mass m and radius r. Spherical planet B has mass and ￼ radius 2r. How does the gravitational field strength at the surface of planet B compare to the gravitational field strength at the surface of planet … 
physics
On planet Seeturn, the free fall acceleration is 9.800 N/kg but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 micro C (5.00*106) is thrown upward …