Bus travellling through town, with a mass of 5040kg and kinetic energy of 493900j. i need the velocity.

v = 14 m/s

Explanation:

KE = 1/2mv²

493900 = (1/2)(5040)(v)²

(v)² = 493900/2520

v = √493900/2500

v = 13.9997

v = 14 m/s

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

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