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Physics Question on collision theory

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

A bullet is shot vertically downwards with an initial velocity of 100 m/s from a certain height.

B

A torque meter is calibrated to reference standards of mass, length and time each with 5% accuracy.

C

A torque meter is calibrated to reference standards of mass, length and time each with 5% accuracy

D

A torque meter is calibrated to reference standards of mass, length and time each with 5% accuracy

Answer

A bullet is shot vertically downwards with an initial velocity of 100 m/s from a certain height.

Explanation

Solution

The correct option is: A

|v 10| = (100 + 10 × 10) m/s

v 10 = – 200 m/s and v 0 = – 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.