Answer:
Potential energy, P = 500 J
Explanation:
We have,
Weight of the box, W = 50 N
Height of the stairs, h = 10 m
It is required to find the potential energy gained by the box. The potential energy is possessed by an object due to its height. The formula of potential energy is given by :
g is acceleration due to gravity
So, the potential energy of 500 J is gained by the box.
First you must convert Km/hr to m/s. 90 km/hr equals 25m/s (this can be done through a conversion table by plugging in the conversion values). Then you need to see what was given:
vi (initial velocity)= 0m/s
vf (final velocity= 25m/s (90km/hr)
t (time)= 10s
Next you should find an equation that requires only the values you know and gives you the value you're looking for. Sometimes that requires two equations to be used, but in this case you only need one. The best equation for this would be a=(vf-vi)/t. Finally, plug in your values (a=(25-0)/10) to get your answer which would be 2.5m/s^2. Hope this helped!
Cross the railroad tracks but look both ways before crossing over
The average speed of the ball is 0.15 m/s.
The average speed of the ball can be calculated using the formula below.
<h3 /><h3> Average speed: </h3>
This is the ratio of the total distance to the total time traveled by a body
<h3 /><h3>Formula:</h3>
- S = d/t.................. Equation 1
<h3>Where:</h3>
- S = Average speed
- d = total distance
- t = total time.
From the question,
<h3>Given:</h3>
Substitute these values into equation 1
Hence, the average speed of the ball is 0.15 m/s.
Learn more about average speed here: brainly.com/question/4931057
Answer:
a)
b)
Explanation:
a)
= mass of the asteroid = 43000 kg
= initial speed of asteroid = 7600 m/s
= final speed of asteroid = 5000 m/s
= Work done by the force on asteroid
Using work-change in kinetic energy theorem
b)
= magnitude of force on asteroid
= distance traveled by asteroid while it slows down = 1.4 x 10⁶ m
Work done by the force on the asteroid to slow it down is given as
