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

Answer:

Time taken will be 0.5069 sec    

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 $7km/hr=\frac{73\times 5}{18}=20.277m/sec$

From first equation of motion v = u+at

So $20.277=0+40\times t$

t = 0.5069 sec