Question

Can someone please answer this fast

Answer 1

Answer 1.

Given,

Force, F = 100 N

Mass of the body, m = 20 kg

Therefore, Acceleration is given by,

Acceleration, a = F/m = 100/20 5m/s^2

Now, Initial velocity, u = 0

Final velocity, v = 100 m/s

Acceleration, a = 5m/s^2

Therefore, Time for which the force is applied,

t = v-u/a = 100 - 0/5

= 20s

Answer 2.

Given:

m=150g=0.15kg

u=30m/s

v=0m/s

t=0.05sec

F=mxa

=0.15 * (v-u)/t

=0.15*(0-30)/0.05

=3 x -30

=-90N

Answer 3

Given: Mass =2 kg, Initial velocity u=0, Final velocity v=30 m/s, Time t=1 s

Step 1: Equation of motion for finding the acceleration

As the acceleration is constant, so using the first equation of motion,

v=u+at

So, Acceleration a=

t

v-u = 1

30−0

=30m/s

2

Step 2: Newton’s Second law for finding the Force

Force, F=m×a=2×30=60 N

Hence 60 N force is required