$A$ wooden block of mass $10\,kg$ is placed on a rough horizontal surface. $A$ force of $49\,N$ is required to pull it. Find the coefficient of friction and the angle of friction.

• A
  $\mu = 0.5, \theta = 26^{\circ} 34^{\prime}$
• B
  $\mu = 0.4, \theta = 20^{\circ} 34^{\prime}$
• C
  $\mu = 0.6, \theta = 30^{\circ} 34^{\prime}$
• D
  $\mu = 0.5, \theta = 45^{\circ}$