A ball is thrown directly downward with an initial speed of 6.43 m/s from a height of
38.1 m.
After what interval does the ball strike
the ground? The acceleration of gravity is
9.8 m/s
2
.
Answer in units of s

terd muffin is the correct answer

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j