Question

B?

Answer 1

you can use one of the kinematic equations for this

v_f = v_i + at

where v_f and v_i are the initial and final velocities, a is the acceleration due to gravity (given) and t is the time

first solve for t, then we will plug this into another kinematics equation

Answer 2

well is 13 initial?

Answer 3

good, keep going

Answer 4

0.25 final

Answer 5

0.25 is the mass of the ball.

the final velocity is 0 because at the tip top of the curve the velocity reaches 0

Answer 6

so 0.25=13

Answer 7

oh okay

Answer 8

0=13+9.8

Answer 9

don't forget t

Answer 10

0 = 13 + (-9.8)t

(we will use the negative acceleration since the force is downward)

Answer 11

t=1.33

Answer 12

good, now using another eqn

delta y = v_i * t + (1/2)(a)t^2

evaluate delta y

Answer 13

8.6

Answer 14

good, so D