Question

# a boy is sittingin a car moving with a uniform velocity the boy throws a ball vertically upwards which falls back into his hands a man standing on a road watches the motion of ball the path of motion of ball will be

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Solution

## $\mathrm{Answer}\phantom{\rule{0ex}{0ex}}\mathrm{the}\mathrm{boy}\mathrm{and}\mathrm{the}\mathrm{ball}\mathrm{have}\mathrm{zero}\mathrm{horizontal}\mathrm{relative}\mathrm{velocity}.\mathrm{So}\mathrm{the}\mathrm{path}\mathrm{of}\mathrm{the}\mathrm{ball}\phantom{\rule{0ex}{0ex}}\mathrm{will}\mathrm{be}\mathrm{a}\mathrm{straight}\mathrm{line}\mathrm{for}\mathrm{the}\mathrm{boy}.\phantom{\rule{0ex}{0ex}}\mathrm{But}\mathrm{the}\mathrm{man}\mathrm{standing}\mathrm{on}\mathrm{the}\mathrm{road}\mathrm{has}\mathrm{a}\mathrm{horizontal}\mathrm{relative}\mathrm{velocity}\mathrm{w}.\mathrm{r}.\mathrm{t}\mathrm{ball}.\mathrm{Hence},\mathrm{the}\mathrm{path}\mathrm{of}\phantom{\rule{0ex}{0ex}}\mathrm{the}\mathrm{ball}\mathrm{will}\mathrm{be}\mathrm{a}\mathrm{parabola}\mathrm{for}\mathrm{the}\mathrm{man}.$

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