Question

A boy accidentally dropped a marble from his apartment window. If the mass of the marble is 10 g and the height from which it was dropped was 65 m, what the speed of the marble when it hit the ground? Assume that the air resistance can be neglected and g = 10 N/kg b. 18 m/s d. 0 m a. 12 ms -1 c. 36 m s-1 e. Cannot be determined​

Answer 1

Answer:

36 m/s

Explanation:

we know that H=ut+1/2 gt^2

but u=0 since body is at rest initally

therefore H=1/2 gt^2

65=1/2*10*t^2

t=√13=3.6 s

we also know v=u+at

u=0

therefore v=10*3.6= 36 m/s