<h2>
Hello there! :)</h2>
It's a pleasure to be helping you today with your<u> physics question!</u>
Answer:

Explanation:
We want to find the initial speed of the ball.
To do this, we have to apply the formula for the time of flight of a projectile:

where θ = angle of flight
g = acceleration due to gravity
v0 = initial speed
Therefore, substituting the given values into the formula, we have that:

⇒ 2 ×
×0.8910= 9.8 × 4.2
⇒

That is the initial speed of the ball.
<em />
<em>I hope this helps you!</em>
<em>Good Luck with your Assignment!</em>
Answer: 482.8032 km per hr
Explanation: 300 * 1.609344 =
Answer:
Car body rise on its suspension by 0.0309 m
Explanation:
We have given mass of the car m = 1500 kg
Mass of each person = 90 kg
Speed of the car 
Distance traveled by car d = 3.7 m
So time period 
Frequency 
Angular frequency is 
Angular frequency is equal to 

k = 114109.92 N/m
Now weight of total persons will be equal to spring force


x = 0.0309 m
The answer to your question is hypothesis