A 4 kg object has a velocity, `3.0 hat(i)`m/s at some instant. Eights seconds later, its velocity is `(8.0 hat(i)+10.0 hat(j))` m/s. Assuming that the object is subjected to a constant net force, the magnitude of the force is

Options

A. `(5sqrt(5))/(2)N`
B. `(5sqrt(3))/(8)N`
C. `(8sqrt(5))/(3)N`
D. `(10sqrt(3))/(7)N`

Answer

A

Explanation

Given, mass of an object, `m=4` kg, `u = 3i m//s`
`v=(8 hat(i)+10hat(j))m//s` and time `t=8s`
As we know, equation of the motion