Question

A ball is dropped in the height of 20 m.. Calculate time taken to ball reach the ground

Answer 1

From equation S=ut+gt²

S=20 m
t=0
g=10 m/s²
t=?

S=ut+1/2 gt²
20=0×t + 1/2×10 × t²
20=0+ 1/2×10t²
20×2/10=t²
2×2=t²
therefore t=2 sec