Question

Please please answer this??

Answer 1

Answer:

143 => 2 mm/s

149 =>40 m/s

Explanation:

The answer for 143 will be 2

12 cm in 1 min

120 mm in 60 sec

speed=120/60=2 mm/s

The answer for 149 will be 40 m/s

S=1/2gt²

g=10 m/s²

S=H=80 m from the point of fall

80= 1/2×10×t²

t²=80/5 = 16

t = √16 = 4 sec

v=gt

 =10×4

 =40 m/s

i could solve only those two so hope it helped and pls mark as brainliest:)