question_answer

The velocity-time graphs of two objects A and B make angles of \[\text{3}0{}^\circ \] and \[\text{6}0{}^\circ \] with the time axis. Find the ratio of their acceleration.

Answer:

                \[{{\text{D}}_{\text{4}}}=0+\frac{9.8}{2}\left( \text{2}\times \text{4}\text{1} \right)=\text{4}.\text{9}\times \text{7 };\text{ }{{\text{D}}_{\text{5}}}=0+\frac{9.8}{2}\left( \text{2}\times \text{5}-\text{1} \right)=\text{4}.\text{9}\times \text{9}\] \[{{\text{D}}_{\text{4}}}/{{\text{D}}_{\text{5}}}=\text{ 7}/\text{9}\]