Atennis ball is thrown straight up into the air with an initial velocity of 6.8 m/s. how long does it take to reach the top of the trajectory?

0.69 s

Explanation:

The tennis ball moves upward with constant acceleration of

g = 9.8 m/s^2

in the downward direction. Therefore, the velocity of the ball at time t is given by

v(t) = u - gt

where

u = 6.8 m/s is the initial velocity

g is the acceleration of gravity

t is the time

At the top of the trajectory, the ball has velocity

v = 0

Solving the formula for t, we find the time taken for the ball to reach the top:

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

answer(20) psi;