Question

Luke Autbeloe drops an approximately 5.0 kg object (weight = 50.0 N) off the roof of his house into the swimming pool below. Upon encountering the pool, the object encounters a 50.0 N upward resistance force (assumed to be constant). Use this description to answer the following questions. (Down is usually considered a negative direction) a. Which one of the velocity-time graphs best describes the motion of the object? Why?

Answer 1

Answer:

Graph B represents correct graph for velocity time

Explanation:

Initially the object is dropped under the influence of constant force due to gravity

So here we can say its acceleration is constant due to gravity

hence here the velocity will increase downwards due to gravity and it is given as

$v = 0 + (-10)t$

now when it enters into the pool an upward force of same magnitude will act on it

so net force on it is

$F = 50 - 50 = 0$

so here we will have no acceleration and it will move with constant speed after that

so here correct graph is

Graph B