PHYSICS QUESTIONS AND ANSWERS WITH EXPLANATION
PHYSICS QUESTIONS AND ANSWERS WITH EXPLANATION This blog post contain multiple choice questions on Velocity, acceleration ,power, efficiency of machine, collision of two bodies etc 1.startinh from rest, a Mercedes-Benz car accelerate uniformly at 45m/s² for 70seconds. What distance does it cover in thirty-fifth second of the motion. (A) 1.5x10²km (B) 1.6 x 10 ⁴km (C) 1.6 X 10³km (D) 1.5 x10³km Solution Acceleration ,a =45m/s² Hint : when ever a body accelerate uniformly from rest initial velocity, u=0 The time taken to cover the distance in thirty-fifth second of the motion is the time interval between 34th – 35th seconds Therefore time t = t₃₅ - t ₃₄ S₃₅=ut +1/2at² S₃₄= ut + ½ at² S = S ₃₅- S₃₄ S=(ut ₃₅+1/2at²₃₅ ) - (ut ₃₄+ 1/2at²₃₄ ) u=0 S = 1/2 a(t²₃₅ – t²₃₄ ) S=1/2 x 45(35² – 34²) S= 1/2 x45 (1225 – 1156) S= 1/2 x 45 x69 S = 1552.5 m ...