A bullet is shot vertically downwards with an initial velocity of 100 m/s from a certain height. Within 10s, the bullet reaches the ground and instantaneously comes to rest due to the perfectly inelastic collision. The velocity-time curve for total time t = – 20s will be
(Take g = 10 m/s2)
A bullet is shot vertically downwards with an initial velocity of 100 m/s from a certain height. Within 10s, the bullet reaches the ground and instantaneously comes to rest due to the perfectly inelastic collision. The velocity-time curve for total time t = – 20s will be
(Take g = 10 m/s2)
The Correct Option is A
Solution and Explanation
The correct option is: A
|v10| = (100 + 10 × 10) m/s
v10 = – 200 m/s and v0 = – 100 m/s
from 10s to 20s velocity remains zero
⇒ from t = 0 s to 10 s velocity increases in magnitude linearly.
⇒ graph given in option A fits correctly.
so, option A image is correct.
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Concepts Used:
Collision Theory
The collision theory states that a chemical reaction can only occur between particles when they collide (hit each other). The collision between reactant particles is necessary but not sufficient for a reaction to take place. The collisions also have to be effective. It is important to understand the exact nature of an effective collision since this determines whether particles react with each other and form new products.
Molecular Collisions
- The more molecules are present, the more collisions will happen.
- Molecules must collide before they can react.
- To effectively initiate a reaction, collisions must be sufficiently energetic
(kinetic energy) to bring about this bond disruption. - As the temperature rises, molecules move faster and collide more vigorously,
greatly increasing the likelihood of bond cleavages and rearrangements. - Most reactions involving neutral molecules cannot take place at all until they have acquired the activation energy needed to stretch, bend, or otherwise distort one or more bonds.