Answer:
F = 5702.56 N
Explanation:
Given that,
Mass of a small car, m = 800 kg
Initial speed of the car, u = 27.8 m/s
Final speed, v = 0
Time, t = 3.9 s
We need to find the force did it take for the car to stop.
The force acting on an object is given by :
So, the magnitude of force acting on the car to stop is 5702.56 N.
Answer:
Explanation:
From the question we are told that:
Height 
Length
Mass 
Final speed 
Generally the equation for Potential Energy P.E is mathematically given by
Therefore
Initial potential energy
Generally the equation for Kinetic Energy K.E is mathematically given by
Therefore
Final kinetic energy
Generally the equation for Work_done is mathematically given by
Therefore
When it comes to horizontal projectiles, the formula for time is:
Where:
dy = vertical distance or height
g = acceleration due to gravity
t = time
Based on the problem, we know that the height at which the tennis ball was thrown is 78.4 m and the acceleration due to gravity is a constant 9.8m/s2. All you need to do is input that into our equation:
The time it would take is
4 seconds.
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first of all the formula of force is F=ma,so we are searching for m,so we can divide a on both sides F/a=m, after this substitute the values given above 64N/4.51=14.2°Kg
