Kinematics Equations Video Lessons

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Problem: A cannonball is shot vertically upward with a velocity of 75 m/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 an explain choice)(a) its acceleration and velocity 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

FREE Expert Solution

This is a kinematics problem. We'll use kinematic equations.

Uniform accelerated motion (UAM) equations, a.k.a. "kinematics equations":

 vf = v0 +atx= (vf+v02)tx= v0t+12at2 vf2= v02 +2ax

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Problem Details

A cannonball is shot vertically upward with a velocity of 75 m/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 an explain choice)

(a) its acceleration and velocity 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

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