(2) Grade 9 (GED) (Grade 9B, G Physics) C С
Choose the correct answer * 15
(0.5 Points)
Which of the selections of equipment contains all the apparatus that would be required
to determine the density of a small, irregularly-shaped stone?
А
Metre ruler, balance
B.
Measuring cylinder, balance
с
Measuring cylinder, metre ruler
D
Measuring cylinder, thermometer
A
B
С

Initial velocity,  u = 4.9 m/sfinal velocity = v m/sinitial height,  h₁ =  245 m    final height, h₂ = 0a = -9.8  m/s²time taken = t secondss = ut + 0.5at²⇒  (h₂-h₁) = ut + 0.5at²⇒  0-245 = 4.9t + 0.5×(-9.8)×t²⇒ -245 = 4.9t - 4.9t²⇒ 4.9t² -4.9t -245 =0solving it, we get   t = 7.59sv  = u +  at = 4.9 -9.8×7.59 = 4.9 - 74.38 = -69.48 m/svelocity is  69.48 m/s downward