The speed of an object at the end of 4 successive seconds is 20, 25, 30, 35 mph km/hr

The speed of an object at the end of 4 successive seconds is 20, 25, 30, 35 mph km/hr respectively the acceleration of the object is: 

a) 5m/s^2 

b) 5km/hr^2 

c) 5km/hr/s 

d) 5k sec^2


Solution

The acceleration can be calculated by taking the difference in velocity and dividing by the time interval. Here, the time interval is 4 seconds, so the acceleration can be found as follows:

(35 mph - 20 mph)/4 seconds = 15 mph/4 seconds = 3.75 mph/sec

So, the acceleration is approximately 3.75 km/hr/s, or 5 km/hr/s (rounded to the nearest whole number).

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