Question

The head of a rattlesnake can accelerate at 40 m/s2 in striking a victim. If a car could do as well, how long would it take to reach a speed of 73 km/h from rest?

Answer 1

Time taken will be 0.5069 sec

Step-by-step explanation:

Acceleration of the car is given
`a=40m/sec^2`

Let the car starts from the rest so initial velocity of the car
`u=0m/sec`

Final velocity v = 73 km/hr

So
`7km/hr=(73* 5)/(18)=20.277m/sec`

From first equation of motion v = u+at

So
`20.277=0+40* t`

t = 0.5069 sec