Question

A body of mass 5kg is initial at rest. Due to application of external force of 20N it accelerates. Determine its
1) Velocity in 3 sec
2) Displacement in 3 sec
3) It linear momentum
4) Kinetic energy

Answer 1

Given : A body of mass 5kg is initial at rest

Due to application of external force of 20N it accelerates.

To Find :  

1) Velocity in 3 sec

2) Displacement in 3 sec

3) It linear momentum

4) Kinetic energy

Solution:

m = 5 kg

u = 0

F = 20 N

F = ma

=> 20 = 5a

=> a = 4 m/s²

V = u + at

Velocity at 3 secs

= 0 + 4(3)

= 12 m/s

Displacement in 3 sec

S = ut + (1/2)at²

=> S = 0 + (1/2)4(3)²

=> S = 18 m

Linear Momentum  = mv

= 5 (12)

= 60  kgm/s  or Ns

Kinetic energy = (1/2)mv²

= (1/2)5(12)²

= 360 J

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Answer 2

Answer is given in above 2 photos⤴