Free Fall and Vertical Launch

Considering two bodies with different mass values, which one will hit the ground first? Negect air resistance.

• Both at the same time.

• The elephant

• The boy

• Who throw the elephant?

On Sep 26th, 1993, Dave Munday went over the Canadian edge of Niagar Falls in a stell ball and then fell 48 m to the water (and rocks) below. Neglect the effect of the air and determine time and velocity did it take Munday to reach the water?

• t = 3.2 s ;

  vf = 30.69 m/s

• t = -3.2 s ;

  vf = 30.69 m/s

• t = 9.78 s ;

  vf= 96 m/s

• t = - 9.78 s ;

  vf = -96 m/s

A coin is tossed with an initial speed of 3.5 m/s, What's the height reached by the coin?

• 0.52 m

• 0.62 m

• 1 m

• 0.18 m

A coin is tossed with an initial speed of 3.5 m/s. What's the required time to reach the 0.62 m height?

• 0.19 s

• 0.45 s

• 0.33 s

• 0.36 s

The rain fell from a height of 1700 m. If we could neglect the air resistance, what could be the speed reached by rain drops? Thanks air resistance that reduces the rain drops speed at 8 m/s.

• 8 m/s

• 346.59 m/s

• 18.62 m/s

• 182.63 m/s

In a building under construction a spanner falls down, reaching a speed of 24 m/s. At what height the spanner was located?

• 1.22 m

• 29.36 m

• 2'825.28 m

• 24 m

What's the required speed to launch a stone vertically upwards to reach a height of 50 m?

• 3.19 m/s

• 31.32 m/s

• 19.3 m/s

• 6.38 m/s

A scary armadillo jumps 0.544 m, using a total time in the air of 0.4 s. What's the speed of the armadillo when this is at 0.544m height?

• 3.92 m/s

• 0 m/s

• 1.96 m/s

• 2.18 m/s

A clay ball is launched vertically upwards and returns after 3.8 s. What was the required time to reach the highest point?

• 1.9 s

• 3.8 s

• 7.6 s

• 1.3 s