The gravitational force exerted on a baseball is 2.28 N down. A pitcher throws the ball horizontally with velocity 14.0 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 182 ms. The ball starts from rest.

Question

anonymous · Answer

An electron of mass 9.11 10-31 kg has an initial speed of 2.20 105 m/s. It travels in a straight line, and its speed increases to 6.20 105 m/s in a distance of 4.20 cm. Assume its acceleration is constant.
 
(a) Determine the magnitude of the force exerted on the electron.

anonymous · Answer

$$v^2=u^2+2as$$$$F=ma$$Therefore$$F=\frac{m(v^2-u^2)}{2s}$$Where
v = final velocity
u = initial velocity
a = acceleration
s = displacement
F = force
m = mass
Now it's a simple matter of feeding numbers into a calculator!