Question

a ball is allow to fall from a 90m tall building. then find (1) time taken to reach ground (2) the velocity by which ball strikes the ground​

Answer 1

Explanation:

A=g =10m/s sq.

s= 90m

u=0 m/s

S=ut + 1/2 at sq.

90 = 0* t + 1/2 × 10 × (t) sq.

90 = 5 t sq.

90/5 = t sq.

1 8 = t sq.

root 18 = t

4.2 sec. = t

V = U + AT

V = 0 + 10× 4.2

V = 42 m / s