please answer for these 4 questions

Answers
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Answer:
7 . b)
8. c)
9. a)
10. d)
Explanation:
7. The forces, which meet at one point and their lines of action also lie on the same plane, are known as coplanar concurrent forces. Coplanar non-concurrent forces: The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplanar non-concurrent forces.
8. Mass of the ball is = 0.5kg
velocity = 100 ms
As, Momentum = mass x velocity
= 0.5kg x 100 m/s
= 50 kg m/s (b)
9. If the particle is moving at constant speed along a straight line path, that means the velocity is also constant. If the velocity is constant then accelration is zero. Therefore, force is also zero.
10. Correct option is D
Using cose
Static friction =µgN
= μs mgcosθ
As normal force due to inclined is mgcosθ
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