Question

Please answer questions 11 and 12

Answer 1

Answer:

Explanation:

11.

Initial velocity (u) = 5 m/s

Acceleration due to gravity (a ) = -10 m/s²

If body is thrown in upward direction then we will take final velocity (v) = 0

Distance (s) = ?

Time (t) =?

v²=u²+2as

0² = 5² +2 (- 10) (s)

0= 25 -20s

s = -25/-20

s = 5/4 m.

And

v= u +at

0 = 5 + (-10) t

t = -5/-10

t = 0.5 sec.

12.

u = 20 m/s

a= 1/2 m/s²

t = 20 s.

s = ?

s = ut + 1/2 at²

s = (20) (20) + 1/2* 1/2 * 20²

s = 400 + 1/4 *400

s = 400 + 100

s = 500 m.