Question

A projectile of mass $0.5\text{kg}$ is thrown with a velocity of $30\text{m/s}$ at an angle of ${60}^{\circ }$ with the horizontal. Find the net force acting on the body when in air. (Take $g=9.8m/s^2$)

• A. $9.8\text{N}$
• B. $4.9\text{N}$
• C. $14.4\text{N}$
• D. $10\text{N}$

Answer 1

The correct option is B $4.9\text{N}$

During the projectile motion, there is no acceleration in the horizontal direction. Thus, there is no force acting in the horizontal direction but gravity acts downwards.
Hence, force acting on the body = $F=mg=0.5\times 9.8=4.9\text{N}$