At take off, a plane flies 100 km north before turning to fly 200 km east. How far is its destination from where the plane took
off?
Question 3 options:
200 km
300 km
173 km
224 km
Question 3 options:
200 km
300 km
173 km
224 km
2 answers:
The destination is 224 km from where the plane took off. Therefore correct option is (d).
First the plane turns 100 km North, and than 200 km East. Since both the directions are perpendicular to each other, therefore we can apply the Pythagoras theorem to calculate the distance between the destination and the point where plane took off
=100^{2}+200^{2}
D=223.60 km=224 km
Therefore, The destination is 224 km from where the plane took off
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Given :
Initial speed of car A is 15 m/s and initial speed of car B is zero.
Final speed of car A is zero and final speed of car B is 10 m/s.
To Find :
What fraction of the initial kinetic energy is lost in the collision.
Solution :
Initial kinetic energy is :
Final kinetic energy is :
Now, fraction of initial kinetic energy loss is :
Therefore, fraction of initial kinetic energy loss in the collision is 1.25 .