Projectile Motion

Classical Mechanics Level 1

In a projectile motion, which of the following is true about the components of velocity of the system?

Assume the system is a ground projectile.

Only the horizontal component is constant Only the vertical component is constant Both the horizontal and vertical components are constant Neither of the two components is constant

Swapnil Das by Swapnil Das , 20, India

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2 solutions

Rohit Ner
Jun 16, 2015

According to Newtons First Law, along the horizontal there acts no external force as that in the case along the vertical (where gravity acts). Hence the horizontal velocity vector remains unchanged throught out the trajectory of the projectile.

Please mention the components of which vector you are talking about.

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Thank You, I have changed the question accordingly.

Swapnil Das - 5 years, 12 months ago
Prokash Shakkhar
Dec 15, 2016

For projectile motion, a projectile has two dimensional motion. One motion is on X - axis and Another motion is on Y- axis.. Now, the main point came. We know gravity works on Y -axis. As, there is no acceleration on X- axis, the horizontal component v 0 c o s θ v_0 cos\theta is constant..

2 Helpful 0 Interesting 0 Brilliant 0 Confused

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