Question

A bullet moving at 35m/s penetrates 3.5m in a wooden plank and comes to me
Assuming uniform retardation, find the uniform retardation of the bullet
A)175m/s2 B)-175m/s2 C)17.5m/s2 D)-17.5m/s2​

Answer 1

Answer :-

Given :-

• Initial velocity = 35 m/s
• Displacement = 3.5 m
• Final velocity = 0

To Find :-

• Uniform retardation

Solution :-

Here, we are given displacement, initial velocity and final velocity. So, by substituting the value in 3rd equation of motion, we can find the retardation.

⇒ v² = u² + 2as

⇒ 0 = (35)² + 2 ( 3.5 ) a

⇒ 1225 = -7 a

⇒ a = - 1225 / 7

⇒ a = - 175

Retardation of bullet = 175 m/s²

Answer 2

Answer:

a=-175

Explanation:

u = 35mpers

s = 3.5m

v = 0

Now we should apply formula v square= u square +2as

0=35whole square +2(3.5)a

1225=-7a=-175

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