Browse Questions

# A juggler is maintaining four balls in motion, making each in turn to rise to height of 20 m. With what velocity does he project them ?

$\begin{array}{1 1}(A)\;30ms^{-1}\\(B)\;20ms^{-1} \\(C)\;9 ms^{-1} \\(D)\;67 ms^{-1} \end{array}$

$v^2= u^2+2ah$
Gives on putting $v=0,h=20m,a=-g=-10ms^{-2}$
$0=u^2-2 \times 10 \times 20 ,u= 20 ms^{-1}$
Hence B is the correct answer.
{"extraction_info": {"found_math": true, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 1, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0, "math_score": 0.8894102573394775, "perplexity": 1998.119439871491}, "config": {"markdown_headings": true, "markdown_code": true, "boilerplate_config": {"ratio_threshold": 0.18, "absolute_threshold": 10, "end_threshold": 15, "enable": true}, "remove_buttons": true, "remove_image_figures": true, "remove_link_clusters": true, "table_config": {"min_rows": 2, "min_cols": 3, "format": "plain"}, "remove_chinese": true, "remove_edit_buttons": true, "extract_latex": true}, "warc_path": "s3://commoncrawl/crawl-data/CC-MAIN-2017-04/segments/1484560281069.89/warc/CC-MAIN-20170116095121-00174-ip-10-171-10-70.ec2.internal.warc.gz"}