Question

A force of 100 N acting on a certain mass for 4 sec gives it a velocity of 20 m/s. Find the mass of the body if the body was initially at rest.

Answer 1

Answer - 20 kg

Explanation:

•Given that

Force (f) → 100 N

Time (t) → 4 seconds

Final velocity (v) → 20 m/s

Initial Velocity (u) → 0

•To find → Mass m

We know that ,

★Force = Mass × Acceleration

→ F = m×a

Also , acceleration a = v - u /t

a = 20 - 0 / 4

•°• a → 5 m/s²

Putting in the formula ,

_____________________

↪100 = m × 5

→ m = 100/5

°•° Mass = 20 kg.

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Answer 2

$\huge\mathbb\purple{Here\:is \:the \:answer}$

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M = 5 kg

u = 10 m/s

F = 20 N

t = 1 sec

v = ?

acceleration = $\frac{Force}{mass}$

a = $\frac{20}{5}$

a = 4 m/s

V = u + at

V = 10+ 4 *1

V = 10+4

$\huge\boxed{v = 14 m/s}$

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$\huge\mathbb\purple{Hope\:it\:helps}$