Answer:
2.25 seconds
Explanation:
Change in Acceleration = change in velocity / time interval
time interval = change in velocity / change in acceleration
= (9 - 0) / (0 - -4) = 9/4
= 2.25 seconds
Answer:
Negative acceleration
Explanation:
We know that
v= u+at
Where v is the final velocity
u is the initial velocity velocity
a is the acceleration
t is time
When final velocity of train will be zero .
v=0
0= u+at
a=- u/t
So from above we can say that acceleration will be negative .When acceleration is positive then train will never come in rest position.
Answer:
The average velocity of the ball is 1.355 cm/s.
Explanation:
Given;
initial displacement of the ball, x₁ = 8.4 cm
final displacement of the ball, x₂ = 4.2 cm
initial time, t₁ = 3.0 s
final time, t₂ = 6.1 s
The average velocity of the ball is calculated as;
Therefore, the average velocity of the ball is 1.355 cm/s.