A projectile is fired from a table. The initial height of the cannon-ball at lau

Question

A projectile is fired from a table. The initial height of the cannon-ball at launch is 120cm. above the floor, the cannon ball is launched with an initial speed of 5.0 m/s horizontally. Neglect air resistane, take upwards as the positive direction, and use g=9.8 m/s^2

Q1: Determine the horizontal and vertical components of the acceleration vector during flight.

Q2:Determine the horizontal and vertical components of the velocity vector at launch.

Q3:Determine the height of the projectiole when it strikes a target on a wall 120cm to the right of the cannon.

Help please, I didn't get this one right for my midterm, and it is still confusing me.

Explanation / Answer

q1. horizontal component of acceleration =0

vertical component of acceleration = 9.8 -j

q2. horizontal component of velocity = 5i

vertical component of velocity =0

q3. time taken to hit the wall = 1.2/5 = 0.24 s

vertical distance travelled = 1/2 x gt^2 = 1/2 x 9.8 x 0.24^2= 0.28224 m

height of projectile = 1.2-0.28224 =0.91776 m

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