Classes
Class 9Class 10First YearSecond Year
$6.2 A block weighing 20 \mathrm{~N} is lifted 6 \mathrm{~m} vertically upward. Calculate the potential energy stored in it.(120 J)$

$v. The kinetic energy of a body of mass 2 \mathrm{~kg} is 25 \mathrm{~J} . Its speed is(a) 5 \mathrm{~ms}^{-1} (b) 12.5 \mathrm{~ms}^{-1} (c) 25 \mathrm{~ms}^{-1} (d) 50 \mathrm{~ms}^{-1}$

$6.1 A man has pulled a cart through 35 \mathrm{~m} applying a force of 300 \mathrm{~N} . Find the work done by the man.(10500 J)$

$How large a force is required to accelerate an electron \left(\mathrm{m}=9.1 \times 10^{-31} \mathrm{~kg}\right) from rest to a speed of 2.0 \times 10^{7} \mathrm{~ms}^{-1} through a distance of 5.0 \mathrm{~cm} ?$

$6.5 Define energy give two types of mechanical energy.$

$When a rocket re-enters the atmosphere its nose cone becomes very hot. Where does this heat energy come from?$

$What sort of energy is in the following:(b) Water in a high dam$
{"found_math": true, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 7, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "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}