Question

A stone is thrown upwards 20m/sec. What is its speed after 2 seconds?

Answer 1

0.4 m/s

Step-by-step explanation:

final speed = initial speed + ( acceleration due to gravity * time)

final speed = 20m/s + ( 9.8m/s^2*2 sec )

final speed = 20m/s - 19.6 m/s

final speed = 0.4m/s in 2 sec