The velocity of the ball when it reaches the ground is equal to B. 68.6 m/s. This value was obtained from the formula Vf = Vi + at. Vf is the final velocity. Vi is the initial velocity. The acceleration is "a", while the time of travel is "t". The solution is:
<span>Vf = Vi + at
</span>Vf = 0 + (-9.8 m/s^2) (7 s)
Vf = -68.6 m/s
The negative sign denotes the direction of the ball.
An airplane is flying at a constant speed in a positive direction. It slows down when it approaches the airport where it's going to land. this is an example of negative acceleration (D).
Answer:
1 N
Explanation:
First the equation is momentum = Force / distance
20 cm = 0.2 m
5 N/m = F / 0.2 m
F = 1 N
Answer:12,352 cal
Explanation:
Given
to change 16 gm ice at 
First we need to take ice to 
then change its state to water and then raises water temperature from 0 to 
.
After it change water phase to steam and then raise its temperature to 
+
Q=12,352 cal
Answer:
Velocity
Explanation:
The gradient= change in velocity
——————————
Change in time
