3 years ago

if an object is falling on earth at a terminal velocity of 140 km/hr, does that mean that the acceleration is ZERO?

1 answer:

7 0

If he's falling in a straight line and his speed is not changing, that tells you that his acceleration is zero.

And THAT tells you that the forces on him are balanced, the net force acting on him is zero, and his motion is the same as it would be if there were NO force acting on him.

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Two ice skaters approach each other at right angles. Skater A has a mass of 32.7 kg and travels in the x direction at 2.3 m/s. S

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Answer:

Final speed, v = 1.25 m/s

Explanation:

Given that,

Mass of skater A, $m_A=32.7\ kg$

Initial speed of skater A, $u_A=2.3i\ m/s$ (x axis)

Mass of skater B, $m_B=93.3\ kg$

Initial speed of skater B, $u_B=1.51j\ m/s$ (y axis)

It is mentioned that the two skaters collide and cling together. It is case of inelastic collision in which momentum remains conserved. Let V is the final speed of the couple. It is given by :

$m_Au_A+m_Bu_B=(m_A+m_B)V$