Question

A stone is thrown downward at 30 m/s. What is its speed, [2]

a)after 1s b) after 2s

Answer 1

v=u+at

a=9.81

u=30 m/s

a) t=1 s

$v=30 + 9.81 \times 1 = 39.81\; m/s$

b) t= 2 s

$v= 30 + 9.81 \times 2 = 49.62\; m/s$