Question

Q.2 - A ball, 5 m above the ground, is launched vertically downward with an initial speed vo = 4 m/s. Determine the speed of the ball at point A, just above the ground. Neglect air resistance. (VA = ?) *-*m/s oo - 22.503 m/s 45.889 m/s 10.770 m/s 1.316 m/s Q.4 - A force of kinetic friction fx = 5 N acts on a block for a distance d = 0A = 7 m. At point O, the block has a mechanical energy E = 50). Determine the mechanical energy at point A. (Ex = ?) E = 501 o 1-SN 15 J 25 J 12 J 2J

Answer 1

2 ) 2 is mechanical energy in 15 J to EA 6) 92 of opp 5x7ong away from the charge v2 = u² +2us - 4 m/s azgorom) s² h = 5m 16+ 2x10x5 116 Va 116 2 10.77 ons 2 As there change in elevation Only change change in kinetic energy het Dwork done - Work clone by friction 5x7 = -355 Eo - 35 50-35: is attaracted by 9, 9, 293 are of opposite nature is 92 93 nature 98 93 their die opposite similer 9, 9, positive 93 K 9,92 qk9,92 :qf 7) FC d² (6/² d? 4 500x kes to Req 22 9x10 : Electric field is goo pointing 9. С 5) 92 +5x10 11 11 2 93 is 오이 aze 292 negative 2 so 9, >o k 9,4 f's 4 F tas > F'z 9x109 9 (.12 =) 9 7500 8 ) c) ac As ve n