Question

1) A body starts with an initial velocity of 20 m/s and acceleration 5 m/s2. Find the distance covered
by it in 5 s. [4M]
2) Why it is difficult to climb up on greasy pole? [3M]
3) Name the SI unit of linear momentum and rate of change of linear momentum. [3M]​

Answer 1

1. Given :-

Initial Velocity of body = u = 20 ms-¹

Acceleration = a = 5 ms-²

Time = t = 5s

Using Second equation of Motion,

S = ut + 1/2 at²

S = 20 × 5 + 1/2 × 5 × 5 × 5

S = 100 + 62.5

S = 162.5 m

2. It is difficult to climb up on greasy pole. This is because grease is a friction reducing agent and when we apply grease on the pole. It thus, reduces its friction very much almost equal to zero. Therefore, we cannot climb on poles.

3. The S.I. Unit of Linear Momentum is Kgms-¹ and rate of change of linear momentum is called as Force and S.I. unit of force is Newton(N).