A 90.5-kg cannon is loaded with a 104-gram ball. The cannon is fired and propels the ball forward. A photogate measurement determines that the cannon recoiled backwards with a speed of 20.8 m/s. Determine the speed of the ball.

18100 m/s.

Explanation:

conservation of momentum can be applied in solving this question, by using below expresion

mv = MV

where M = mass of recoil of canon =90.5kg

V =velocity of recoil of canon = 20.8 m/s.

m= mass of tennis ball=204g=104x 10⁻³kg

v = velocity of tennis ball

104 x 10⁻³ x v = 90.5 x 20.8

We can make V subject of formula

v = (90.5 x 20.8) / 104 x 10⁻³

v = 18100 m/s.

Hence, the speed of the ball is 18100 m/s.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

80cm/s.

24cm/s.

53.3cm/s.