Physics, asked by aestheticxrose, 9 months ago

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

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Answers

Answered by dipamcool2016
0

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.

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