The chemical formula for two substances are Fe and Fe2O3 which is an element and which is a compound how would you justify the s
1 answer:
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Answer:
Explanation:
Impulse on an object is given by .
However, it's also given as change in momentum (impulse-momentum theorem).
Therefore, we can set the change in momentum equal to the former formula for impulse:
.
Momentum is given by . Because the truck's mass is maintained, only it's velocity is changing. Since the truck is being slowed from 26.0 m/s to 18.0 m/s, it's change in velocity is 8.0 m/s. Therefore, it's change in momentum is:
.
Now we plug in our values and solve:
(two significant figures).
Answer:
Average speed of car will be 48 km/hr
Explanation:
Let the total distance is 2d
It is given that first half of the distance car travels with a speed of 40 km/hr
So time taken to cover half of the distance
Second half of the distance is covered with a 60 km/hr
So time taken to cover second half of the distance
So total time to cover 2d distance
Average speed is the ratio of total distance to total time
So average speed
So average speed of car will be 48 km/hr