Answer:
• let's first get time
• let's find horizontal displacement
- g is acceleration due to gravity [ vertically: g is 10 m/s². horizontally: g is 0 ]
C. excretory.
Hope this helped!
In vacuum, going at 2.99×10^8 m/s.
A rock falls from a cliff. 19.6 m is its displacement after 2 seconds
Answer: 19.6 m
<u>Explanation:
</u>
The rock falling from the cliff falls under the effect of gravity. And as it falls, the initial velocity is zero. To calculate the displacement of the rock which fell from the cliff, after 2 seconds, use the equation of motion, as follows,
We know that 2nd equation of motion,
Given that t=2 sec and u=0. Putting the values into the equation, we get,
Answer:
Power, P = 112500 watts
Explanation:
It is given that,
Mass of the car, m = 1500 kg
Initial velocity of the car, u = 0
Final velocity of the car, v = 30 m/s
Time taken, t = 6 s
The minimum average power delivered by the engine is given by :
P = W/t
Where
W = work done
t = time taken
Work done = change in kinetic energy
So,
P = 112500 watts
So, the minimum average power delivered by the engine is 112500 watts. Hence, this is the required solution.