through the Doppler effect. The formula for apparent frequency is derived as F apparent = F real x (Vair ± Vobserver) / (Vair ± Vsource). In this scenario, should the observer move towards the source—place a positive sign in the numerator and a negative in the denominator. Since the observer approaches the wall, we apply the formula to derive the necessary speed.
The kangaroo reaches a maximum vertical altitude of 2.8 m, which can be calculated using the formula 2.8 = 1/2 * 9.8 * t^2. Thus, applying the equation s = ut + 1/2at^2.
Response: 800N
Clarification:
Provided data:
Ball mass = 0.8kg
Contact duration = 0.05 seconds
Final and initial speed = 25m/s
The average force exerted by the ball on the wall can be calculated using the following relationship:
Force (F) = mass (m) * average acceleration (a)
a= (initial velocity (u) + final velocity (v))/t
m = 0.8kg
u = v = 25m/s
t = contact time of the ball = 0.05s
Thus,
a = (25 + 25) ÷ 0.05 = 1000m/s^2
Hence,
The average force magnitude (F)
F=ma
m = ball mass = 0.8
a = 1000m/s^2
F = 0.8 * 1000
F = 800N
