Question

A body is projected obliquely from the horizontal ground. Its speed is minimum at

(A)point of projection

(B)point where it lands on the ground

(C) maximum height

(D)middle of its motion of ascent​

Answer 1

Given : A body is projected obliquely from the horizontal ground.

To Find : Its speed is minimum at

(A)point of projection

(B)point where it lands on the ground

(C) maximum height

(D)middle of its motion of ascent​

Solution :

Velocity has two components

Vertical velocity & horizontal Velocity

Horizontal Velocity will remain constant

Hence Speed will be minimum when vertical velocity  is Minimum/Zero

Vertical velocity is Zero at Maximum height

Hence speed is minimum at maximum Height

A body is projected obliquely from the horizontal ground. Its speed is minimum at   maximum height

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Answer 2

HELLO DEAR,

GIVEN:- A body is projected obliquely from the horizontal ground .Its speed is minimum at__________.

SOLUTION:-The above motion is a projectile motion .There are two components of intial velocity u.

i) In horizonatal direction ( u coseQ)

ii) In vertical direction. ( u sineQ)

Here horizontal component is constant (acceleration=0)

But vertical component is not constant ( acceleration= -g).

So, at the maximum height point velocity will minimum or zero .

H=( u^2 sin^2Q)/(2g).

Therefore option (C) at maximum height is correct.

I HOPE IT'S HELP YOU DEAR,

THANKS.