A cannon ball is shot vertically upward with a velocity of 50m/s. (i) Calculate

Question

A cannon ball is shot vertically upward with a velocity of 50m/s. (i) Calculate how long it takes for the cannonball to reach its highest point. (ii) while it is rising in the air (choose one and explain your choice). Please explain the answer as well.

A) its velocity and accleration are both upward.

B) its velocity is upward and its acceleration is downward.

C) its velocity and acceleration are both downward.

D) its velocity is downward and its acceleration is upward.

E) its velocity and acceleration are both increasing.  

Explanation / Answer

INITIAL VELOCITY U IS 50M/S UPWARDS

acceleration due to gravity acts downwords

so using kinematical equation

v=u+at

v (final velocity)=0

0=50+(-9.8)*t

so t=50/9.8
=5.10 sec

B) its velocity is upward and its acceleration is downward.

its obvious as its thrown upwards

and gravity is acting downwords reducing magnitude of velocity

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