Answer:
A. 1.8x10⁵
Explanation:
For this question we have
72km/h = speed
Total mass = 2250kg
Stopped at t = 0.2250s
To get average force acting on this car on collision:
72km/3.6 = 20m|s
Impulse = ∆p
This implies:
F∆t = m∆v
F = m∆v/∆t
= 2250x20/0.250
= 180000
= 1.8x10⁵
Therefore option A is correct.
If the distance is proportional to the square of the time, then the distance in 9 seconds will be (9/8)² as long as the distance in 8 seconds.
(9/8)² = 1.265625
(64 ft) · (1.265625) = <em>81 ft. </em>
factorise 1/10^2 out of both.
add 1/4.5 to 1/9.4 .... common denominator 4.5x9.4
multiply result by 1/10^2
find reciprocal of result
phew !
Answer:
16m/s
Explanation:
Therefore, the speed after 8 seconds is 16m/s
