A football punker attempts to kick the football so that it lands on the ground 67.0 m from where it is kicked and stays in the air for 4.50 s.

At what angle and with what initial speed should the ball be kicked?

Assume that the ball leaves the punker’s foot at a height of 1.23 m.

To solve this problem we will apply the linear motion kinematic equations. We will find the two components of velocity and finally by geometric and vector relations we will find both the angle and the magnitude of the vector. In the case of horizontal speed we have to

The vertical component of velocity is

Here,

h = Height

g = Gravitational acceleration

t = Time

= Vertical component of velocity

The direction of the velocity will be given by the tangent of the components, then

The magnitude is given vectorially as,

Therefore the angle is 55.59° and the velocity is 26.37m/s

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

its lower due to the doppler effect.: apex