Question

A stone is dropped from the edge of a roof.Find the speed of the stone at 2s after the stone was dropped.
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Answer 1

In the given free fall,

u = 0 m/s

t = 2 sec

g = 10 m/s²

g = (v -u) /t

10 = (v - o) /2

10 = v/2

10 × 2 = v

v = 20 m/s

Answer 2

Question:

A stone is dropped from the edge of a roof.Find the speed of the stone at 2s after the stone was dropped.

Answer:

20 m/sec

Explained Answer:

Given:

• Initial Velocity = 0m/s
• Acceleration due to Gravity = 10m/s²
• Time = 2s

Formula:

• v = u + at

Here,

• v = Final Velocity
• u = Initial Velocity
• a = Acceleration due to Gravity
• t = Time

So, According to Question:

Asking:

Speed

• v = u + at
• v = 0 + 10 × 2
• v = 20 m/sec

So, the speed of the stone at 2s after the stone was dropped is 20 m/sec.

$\LARGE { \blue{ \bf{20m/sec Ans}}}$