The distances(inm

m) above the ground for a projectile fired vertically upward with a velocity of 4[a]

[a]m/s

m/sas a function of timet(ins

s) is given by s=4[a]t4.9t²

s=4[a]t4.9t².

a=4.Simply replace the letter with the corresponding digit. Do not multiply. For example, if[a]=1

[a]=1, then4[a]

4[a]is 41.

Find the answers to these questions.

• find
• tforv=0
• find
• vfort=4
• find
• vfort=5
• What conclusions can you draw?