Answer:
The force is -1620.73 N.
Explanation:
Given that,
Mass of car = 1000 kg
Velocity = 1 m/s
Distance = 2 m
Angle = 30°
We need to calculate the force
Using formula of work done





Put the value into the formula


Hence, The force is -1620.73 N.
B) through space I am sorry if it is wrong
<u>Answer:</u>
Takeoff speed of Kangaroo = 12.91 m/s
<u>Explanation:</u>
The distance reached by Kangaroo = 10 meter
Angle at which it jumps = 18°
The motion of Kangaroo is like a projectile, the distance traveled is the range of projectile.
Range of projectile = Time taken for the projectile to reach ground* Horizontal velocity
Time taken for the projectile to reach ground:
Time taken = Two times of the time taken for the projectile to reach maximum height
Time taken for the projectile to reach maximum height = Vertical speed / Acceleration = u sin θ/g
Time taken for the projectile to reach ground = 2 u sin θ/g
So Range of projectile = 
We have Range = 10 meter, θ = 18⁰
Substituting

Takeoff speed of Kangaroo = 12.91 m/s
Answer:
185.95 μsec
Explanation:
Given that:
Sine wave = 

Sinusodial signal
= 50 kHz = 
Rise time is said to be defined as the time needed for a pulse to rise from 10% - 90% of maximum rate.
∴
= 10% = 0.1 Am
=90% = 0.9 Am
Using sine wave for
; we have:
= 0.1 Am
= 0.1

= 5.7392


Using sine wave for
; we have:
= 0.9 Am

= 
= 64.158
= 
= 
Change in rise time
=
- 
= 
= 
= 
since;
= 50 kHz = 
= 
= 1.85952 × 10⁻⁴
= 185.952 × 10⁻⁶ sec
= 185.95 μ sec
∴ The rise in time in (μ sec) for the sinosodial signal at 50 kHz = 185.95 μ sec
The wave diagramed in blue.