Question

For an oblique projectile, at its maximum height
(A) speed is zero
(B) velocity is parallel to acceleration
(C) speed is half of the initial speed
(D) velocity is perpendicular to acceleration​

Answer 1

Given : An oblique projectile,

To Find : at its maximum height

(A) speed is zero

(B) velocity is parallel to acceleration

(C) speed is half of the initial speed

(D) velocity is perpendicular to acceleration

Solution :

Velocity has two components

Vertical velocity & horizontal Velocity

Horizontal Velocity will remain constant

Vertical velocity is Zero at Maximum height

Hence speed at maximum Height  is equal to horizontal speed , not zero

(A) speed is zero - FALSE

(C)  speed is half of the initial speed - only if Horizontal Speed = 1/2 of initial speed  Hence FALSE

As at maximum height only horizontal velocity is there

Hence its direction parallel to ground

While acceleration acting on body is perpendicular to ground  

Hence (B) velocity is parallel to acceleration - FALSE

Hence  velocity is perpendicular to acceleration​   - TRUE

option (D) velocity is perpendicular to acceleration​  is correct

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Answer 2

Answer:

Explanation:

At the maximum height of projectile, of proectile, the vertical component velocity becomes zero and only horizontal component velocity of projectile is there