Question

v^2=2×9.8 ×19.6=(19.6)^2

Answer 1

Explanation:

Using formula: v^2-u^2=2as

Initial velocity(u)=0

Distance(s)=19.6m

Acceleration(a) = 9.6 (due to gravity)

Therefore substituting the values

v^2= 2(9.8)(19.6)

v^2=(19.6)(19.6)

v^2=(19.6)^2

thus, v= 19.6 m/s

Answer 2

u = 0

g = 9.8m/s

h = 19.6m

v = ?

Now, v²= u²+2gh

or, v² = 0²+2×9.8×19.6

or, v² = 0+384.16

or, v²= 384.16

or, v² = (19.6)²

→ v = 19.6 m/s