PLEASE HELP! I WILL MARK BRAINLIEST! if you don’t know, search from google and find good answers, i can’t google because i have loads of hw
Answers
Solutions:
1. Initial Velocity (u) = 20 km/hr
Final Velocity (v) = 50 km/hr
Time (t) = 10 s
Acceleration (a) = [v-u]/t
= [50-20]/10 m/s²
= 30/10 m/s²
= 3 m/s²
2. u = 56 km/hr
v = 58 km/hr
t = 1 s
Acceleration (a) = [v-u]/t
= [58-56]/1 m/s²
= 2 m/s²
3. u = 0 m/s
v = 36 km/hr
t = 10 s
Acceleration (a) = [v-u]/t
= [36-0]/10 m/s²
= 36/10 m/s²
= 3.6 m/s²
4. a = 4 m/s²
t = 10 s
u = 0 m/s
v = u + at
v = 0 + 4*10
v = 40 m/s
Distance Covered (S) = ut + 1/2at²
= 0*10 + 0.5*4*10*10 m
= 0+200 m
= 200 m
5. v = 72 km/hr
v in m/s = [72*5/18] m/s
= 20 m/s
t = 10 s
u = 0 m/s
A. v = u+at
= 20 = 0+10a
= 20 = 10a
= 2 m/s² = a
C. v² = u² + 2aS
= 20² = 0² + 4S
= 400 = 4S
= 100 m = S
B. Average Velocity = Total Displacement Done/Total Time taken
= [100/10] m/s
= 50 m/s
6. a = 10 m/s²
u = 0 m/s
t = 2 s
v = u +at
= 0+10*2
= 20 m/s
v² = u² + 2aS
= 20² = 0² + 2*10*S
= 400 = 20S
= 20 m = S
7. a = 8 m/s²
u = 0 m/s
t = 1 s
v = u+at
= 0+8*1
= 8 m/s
v² = u²+2aS
= 8² = 0² + 2*8*S
= 64 = 16S
= S = 4 m
Hope this helps.