Question

A body droppedfrom rest at a height of 80m How long does it take to reach the ground?(g=10ms², ignore air resistance)

Answer 1

Answer:

4 sec

Explanation:

height = 80m

g = 10

u = 0

acceleration due to gravity = 10 m/s²

formula = v² = u² + 2as

v² = 0+2×80×10

v² = 0 + 1600

v² = 1600

v = 40

formula = v = u + at

40 = 0 + 10t

40 = 10t

$\frac{40}{10}$ = t

4 = t

4 sec