Physics - Kinematics Question with Solution | TestHub

PhysicsKinematics2-D & 3DEasy2 minPYQ_2020

PhysicsEasysingle choice

A projectile of mass $m$ is fired from ground with speed $u$ at an angle $θ$ to horizontal. What is the power of gravitational force, when it makes an angle $\frac{θ}{2}$ with the horizontal?

Options:

Answer:

Solution:

$v_{x} = u \cos θ = v \cos \frac{θ}{2}$ , where $v$ is the speed at this instant

$v_{y} = v \sin (\frac{θ}{2}) = u \cos θ \frac{\sin (\frac{θ}{2})}{\cos (\frac{θ}{2})} = u \cos θ \tan (\frac{θ}{2})$

$P = \vec{F} . \vec{v} = - m g u \cos θ \tan (\frac{θ}{2})$

Subject:PhysicsTopic:KinematicsSubtopic:2-D & 3D

⏱ 2mℹ️ Source: PYQ_2020

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