Question

please explain your answer​

Answer 1

Answer:

b. 22

Explanation:

from the 3rd eqn. of motion

v^2 = u^2 + 2as

v^2 = 10^2 + 2 × 1.6 × 120

v = √100 + 32×12

v = 22

Answer 2

Explanation:

Object is descending with 10 m/s. Then u= -10m/s

Use second equation of motion.

$v^2 = u^2 - 2ah\\ v^2=-10^2 - 2 *1.6*120\\v^2=-100-384\\v^2=-484\\v=22 \frac{m}{s}$

in downward direction