Question

A body of mass 2kg is kept at rest.A constant force if 6N starts acting on it find the time taken by the body to move through a distance of 54km ​

Answer 1

Explanation:

here, initial veloctiy(u)= 0

Force acting on it(F)=12N

mass of the body(m)=2kg

displacement of the body(s)=12m

time taken by the body(t)=?

we know,

F=ma

a=F/m=6m/s^2

We know,

s= ut + 1/2at^2

12=1/2×6×t² (as u=0)

t=2 (as t can't be negative)

Answer 2

Answer:

The time taken is t = 2s. We have F = 6N, m = 2kg, s = 24m and u = 0m/s. From F = ma, on substituting the given values for F and m, we get a = 6m/s². at², we substitute for s, u and a, to get t² = 4 ⇒ t = 2s (-2 is neglected since time cannot be negative).