In order to calculate velocity, we'd need to know the straight-line distance between the start and the finish, and we'd also need the direction of that line. The best we can do with the information given in the question is calculate the average SPEED.
Average speed = (total distance covered) / (time to cover the distance).
Distance covered in the first 2 hours = (2 hr) x (40 km/hr) = 80 km.
Distance covered in the second 2 hours = (2 hr) x (60 km/hr) = 120 km.
Total distance covered = (80 + 120) = 200 km
Time to cover the distance = (2 + 2) = 4 hours
Average speed = (200 km) / (4 hours) = 50 km/hour
Answer:
t = 1.5 hours
Explanation:
Given that,
Speed of an airplane, v = 560 miles per hour
Distance, d = 840 miles
We need to find the time taken to cover a distance of 840 miles.

So, the required time is 1.5 hours.
Answer: 6611.715 joules
Explanation:
Q = MxCxdeltaT = 6959.7 which is 100%
95% = 6611.715
Answer:
B
Explanation:
kinetic energy (KE) is the energy possessed by moving bodies. It can be expressed as:
KE =
m
Where: m is the mass of the object, and v its speed.
For example, a stone of mass 2kg was thrown and moves with a speed of 3 m/s. Determine the kinetic energy of the stone.
Thus,
KE =
x 2 x 
= 9
KE = 9.0 Joules
Assume that the speed of the stone was 4 m/s, then its KE would be:
KE =
x 2 x 
= 16
KE = 16.0 Joules
Therefore, it can be observed that as speed increases, the kinetic energy increases. Thus option B is appropriate.