Question

16. A 1.8-kg projectile is fired from level ground. The vertical component of the initial velocity is 80 m/s and the horizontal component is 16 m/s. Ignore air resistance and the curvature of the earth in this problem. How far in meters does the projectile travel horizontally?

19. If one platter of lasagna uses 1.5 cups of tomato sauce, how many cups of tomato sauce will 4 platters of lasagna require?

20. A sprinter runs 53 meters in 7 seconds. What is his average speed?

Answer 1

Given data for question16:

A projectile of Mass = 1.8 kg Fired from level ground.

Vertical component of initial velocity = 80 m/s

Horizontal component of initial velocity = 16 m/s

Concept:

We can find Net initial velocity and angle of projectile from ground, then we will directly use the formula for Range of Projectile motion.

So, Initial velocity of projectile (u) = 81.58 m/s with an angle of 78.69 from horizontal in counterclockwise.

For projectile motion fired from ground, and projectile landed on same level,

projectile travel horizontally =

(q-19)

one platter of lasagna uses 1.5 cups of tomato sauce,

then for 4 platters of lasagna require = 4*1.5 = 6 cups of tomato sauce

(q-20)

A sprinter runs 53 meters in 7 seconds.