If he wants to increase power, force must increase and decrease time.
PLEASE THINK ABOUT THIS AND EXPLAIN FULLY :)
1 answer:
Explanation:
It is given that,
Mass of object, m = 2 kg
Initial velocity, u = 3 m/s (east)
Final velocity, v = - 7 m/s (west)
The Impulse can be calculated using the change in momentum of an object i.e.
J = m(v-u)
J = -20 kg-m/s
So, the Impulse of this object is 20 kg-m/s but the direction is opposite. Hence, statement (1) is correct i.e. Student #1: "The impulse is equal to the change in momentum, which is (2 kg)(3 m/s + 7 m/s) = 20 kg m/s."
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If he wants to increase power, force must increase and decrease time.
Average speed is defined as the ratio of total distance covered in total given time
here we know that total distance that man moved is
so total distance is
now here total time of the motion is
total time will be given as
now by above formula
so his average speed is 30 km/h