Question

please answer this question ​

Answer 1

Explanation:

and is ZERO............

Answer 2

Answer:

D 13500

Explanation:

u = 30

v = 0

a = -10

v = u + at

0 = 30 - 10t

t = 3sec

After three seconds IT will be at the highest point

=> K.E. = 0

only P.E. remains

P.E. = mgh

$h = \frac{ {v}^{2} - {u}^{2} }{2a} \\ \\ = > h = - \frac{ {u}^{2} }{2a} \\ \\ h = 45m$

=> P.E. = 30×10×45 = 13500

HOPE IT HELPS