Question

A baseball having mass of $0.4\,kg$ is known such that one of the forces acting on it varies with time as shown in the first graph. The velocity (which is in the same direction as the force) varies with time as shown in the second graph. Then choose the incorrect option (till $0.3\,s$ ).

• A. The graph of power delivered to baseball and time is a straight line.
• B. The net force on baseball is constant.
• C. For $t>0.2s$ the graph of power delivered to the baseball and time is a parabola.
• D. The net force on baseball is in direction of velocity.

Answer 1

Answer: (C)

Because acceleration of base ball is constant and positive so force is constant and in direction of velocity and $P=\vec{F} \cdot \vec{V}$ Graph straight line.