physics
posted by david
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?

bobpursley
E is uniform? then force is Eq, and is downward.
force gravity=9.8
force electric=5e6*E
total acceleration down=totalforce/mass
at the top, vfinal=zero
vf=vi+at where t=2.05sec
you know vi, t, solve for a. With that a, set it equal to totalforce/mass
and solve for E. Voltage=E*height achieved.
vf^2=vi^2+2ad, now solve for d, knowing E just found.
voltage difference is E*d 
david
What is the final answer going to be and where did you get that t is 2.05 seconds
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 help 3!! **
Based on the following data about planet X (which orbits around the Sun): Planet X's distance from Sun = 3.6*1012 m Planet X's radius = 2*106 m Planet X's mass = 8.2*1022 kg a.) Find gx, the size of the acceleration due to gravity … 
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
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 …