Answer:
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.
