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9. The acceleration of a car as a fuction of time is given by ã=4+5x m/s2. If the initial velocity of car is 15 m/s, then the equation of velocity as a function of distance is...

13. A charged particle is moving with initial speed 100m/s. Motion of particle is accelerated by electric force. The equation acceleration is ã=(2-10t) m/s2. The speed of charged particle for t= 4 s is...?

28. A footbal player kicks a ball and makes an angle of 37^o with the horizontal. Horizontal distance between the ground and the place where the ball was kicked is 60m. The total time of flight is...second?

29. Bullet A and B are fired off from the equal gun with equal initial velocity at an angle of 30^o and 45^o above the horizontal. Ratio horizontal distance between bullet A and B before landing is...?

30. a cannon is fired of bulet with vlocity 10 m/s and makes an angle of 30^o with the hrizntl. What is the spfed of bulet after t=2 s=...m/s?

ã=alpa
^o=derajat

Anonymous · Accepted Answer

(30).

vektor kecepatan,

V(t) = {Vo t cos Φ , Vo t cos Φ + ½ gt²} 

V(2) = {10 * 2 cos (π/6) , 10 * 2 cos (π/6) + ½ (-10)(2)²} 

V(2) = {10 √3, 10 (√3 - 2)}

|V(2)| = √(300 + (20 - 10 √3)²)

|V(2)| ≈  17.5265 m/s

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