Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeEasy2 minPYQ_2020

PhysicsEasysingle choice

A truck is moving with a constant velocity of 54 km/h. In which direction (angle with the direction of motion of track) should a stone be projected up with a velocity of 20 m/s, from the floor of the truck, so as to appear at right angles to the truck, for a person standing on the earth ?

Options:

Answer:

Solution:

Let the stone be projected at an angle α to the direction of motion of truck with a speed of v = 20 m/s.

Since the resultant displacement along horizontal is zero.

The velocity along horizontal = 0

$15 + 20 cos α = 0 \Rightarrow cos α = - \frac{3}{4}$

$\Rightarrow α = {cos}^{-1} (- \frac{3}{4})$

Subject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: PYQ_2020

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