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Grade 12th passThermal Physics

A ball of mass52. 4g is thrown from the ground into the air with an initial velocity of 16.3m/s at an angle of 27.4 with the horizontal. What are the values of its kinetic energy initially and just before it strikes the ground

Rubab syed

7 Years agoGrade 12th pass

1 Answer

Umar Farooq

7 Years ago

Its initial velocity u=16.3 (cos 27.4) i +16.3 (sin 27.4)j

Initial kinetic energy KE_initial=0.5 mu² = 0.5 x 0.0524 x 16.3²= 69.6 J

As there’s no force along horizontal direction v_x=16.3 (cos 27.4)=14.47

v_y= u (sin 27.4) + gT

T= 2u sin (27.4) /g

v_y= 3u (sin 27.4)

v= 14.47 i + 22.5 j

v= 26.75

KE_final =0.5 mv² =0.5 x 0.0524 x 26.75²=187.48 J

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