A car changes velocity at a constant acceleration of 2.5m/s to reach 43.7m/s in 2.7 s how fast was the car moving when it began
1 answer:
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Answer:
The distance covered by the rocket after fuel ran out is
Explanation:
Given that the rocket moves with an acceleration
time
Since the rocket starts from rest initial velocity
The distance it travelled within this time is given by
Velocity at this point is given by
Given that at this height it runs out of fuel but travels further. Here final velocity (maximum height), initial velocity
and time to zero velocity
Thus it travels more after fuel running out. The distance covered during this period is given
Answer:
140°
Explanation:
The law of reflection states that the angle of redlection equals to the angle of incidence.
When light rays hit surface at 20°, they also leave the surface at the same angle
Since the whole surface has 180° then subtracting these two angles from total angle gives the the angle between the incident and reflected rays.
180°-20°-20°=140°
The angle of incidence and reflection are equal hence 140/2=70°
The question needed the angle between the incident and reflected rays which is already calculated as 140°
