A 1.2-kg mass is oscillating without friction on a spring whose spring constant is 3400 N/m. When the mass displacement is 7.2 cm, what is the acceleration?

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

compass can be used day and night, cloudy or sunny

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg