A cannonball is shot vertically upward with a velocity of 75 m/s. (i) Calculate

ID: 1385158 • Letter: A

Question

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

(d) its velocity is downward and its acceleration is upward

(e) its velocity and acceleration are both increasing

**Please explain clearly! id like to be able to solve future problems like this one on my own! Thank you

i) we know time taken to reach up, t = u/g (u is initia speed an g is acceleration due to gravity)

= 75/9.8

= 7.65 s

ii) (b) its velocity is upward and its acceleration is downward

here is the explnation :

As the time passes the ball moves upward so it has velocity upward.

But as the time passes velocity decreases. it means acceleration is apposite to velicty.

so acceerationis is downward.

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