Question

19
A student throws a ball straight down off a very high building
with a magnitude of 3.0m/s. The ball accelerates in free fall
for 2.0s.
What is the velocity at 2.0s?
A 6m/s
B 23m/s
C 18m/s
D 1.5m/s

Answer 1

Answer:

B 23m/s

Explanation:

From the above information we get,

Initial velocity= 3m/s

Acceleration by gravity = 10 m/s2 (approx)

Time taken =2 seconds

v=u+at (First Equation Of Motion)

v= 3 + 10 × 2

v= 23 m/s