Question

which one is correct please give explanation​

Answer 1

Answer - A. 10m/s

Fx = -dU/dx

Fy = -dU/dy

formula for differentiation ,

d(ax+b)/dx = a

Fx = 3 => m . ax = 3 => ax =3

Fy = 4 => m, ay = 4 => ay = 4

used formula, F = m.a for both X and y directions

now , v = u + a.t

vx = ux + ax.t

= 0 + 3 x 2 = 6

vy = uy + ay . t

= 0+ 4 x 2 = 8

v = (vx^2 + vy^2) ^0.5

= ( 36 + 64 )^0.5

= √100

= 10 m/s