Respuesta :
Answer:
Step-by-step explanation:
H=7+30t-16t²
20=-16t²+30t+7
0=-16t²+30t-13
T=(-30±√(900-4(16)13))/-32
T=0.68 s or T=1.2 s
Answer:
Step-by-step explanation:
H=7+30t-16t²
20=-16t²+30t+7
0=-16t²+30t-13
T=(-30±√(900-4(16)13))/-32
T=0.68 s or T=1.2 s