Question

Q2. For how much time should the
force of 400N be exerted on a body of
mass 8kg to increase its velocity from
150m/s to 300m/a?​

Answer 1

Given:

Force, F = 400 N

Mass of Body, m = 8 kg

Initial velocity, u = 150 m/s

Final velocity, v = 300 m/s

To find:

Time = t

Solution:

Let us find acceleration (a) of the body

We know,

Force = Mass × Acceleration

F = ma

400 = 8 × a

a = 400/8 = 50 m/s²

Now to find time:

We know,

Acceleration = (Final velocity - Initial Velocity)/ Time

a = (v - u)/t

50 = (300 - 150)/t

50 = 150/t

t = 150/50

t = 3

Therefore, for 3 seconds the force should be exerted.

Answer 2

Answer:

F = ma

a = v-u/t

F= m * v-u/t

400= 8 * 300-150/t

400= 8* 150/t

400/8=150/t

50t = 150

t= 150/50

t= 3 s

Explanation:

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