Speed=distanse/time
144/12=12
ans is 12m/s
Answer:
False -
F = G M1 M2 / R^2
So F depends on M1 and M2 and as long either is not zero there will be a gravitational force between them.
M = mass of the first sphere = 10 kg
m = mass of the second sphere = 8 kg
V = initial velocity of the first sphere before collision = 10 m/s
v = initial velocity of the second sphere before collision = 0 m/s
V' = final velocity of the first sphere after collision = ?
v' = final velocity of the second sphere after collision = 4 m/s
using conservation of momentum
M V + m v = M V' + m v'
(10) (10) + (8) (0) = (10) V' + (8) (4)
100 = (10) V' + 32
(10) V' = 68
V' = 6.8 m/s
You didn't give us a photo of Figure 4-18, so we don't know anything about
the sports car. But here's how to answer the question on your own:
Acceleration = (change in speed) divided by (time for the change)
and
Change in speed = (end speed) minus (start speed)
So, the garbage truck's acceleration is ...
(100 km/hr - 0) / (10 sec)
= 10 km/hr per second .
Calculate the acceleration of the sports car the same way,
and then you can compare them.