Question

Find the sum of following AP : 1,3,5,7,…… to 25 terms. (a) 625 (b) 425 (c) 325 (d) None of these​

Answer 1

Answer:

325 ans.

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Answer 2

Answer Step-by-step explanation:

Statement of the given problem,

A car is moving horizontally along a straight line. A ball is projected from this car in such a way that it will return to the car after it has moved 100 m.The speed of the ball is?

Let the ball be projected with velocity U (in m/s) and at an angle θ with the horizontal.

The ball will undergo 2-D motion in vertical plane and it will act as a projectile following a parabolic trajectory whose horizontal range (R, as shown below) will be 100 m.

Hence from above data we get as follows,

U^2*(sin2θ)/g = 100 [R = U^2*(sin2θ)/g (g = gravitational acceleration)]

or U^2 = 100*g/sin2θ

or U = 10*√(g/sin2θ) [Ans]