Question

a body is moving with a velocity of 100m/s accelerates uniformly at a rate of 10m/s^2 for a period of 20 sec . calculate the velocity & distance travelled in 30 seconds

Answer 1

v=u+at
v=100+10×20
v=100+200
v=300
then
s=ut +1

Answer 2

Hey.

Here is the answer.

as V= u + at
so, v = 100 + 10×20 = 100+200 = 300 m /s

so, velocity will remain 300 m/s after 30 s .◆

Distance travelled in first 20 s

s = ut + 1/2 at^2 = 100×20 + 1/2× 10×20×20 = 2000+2000= 4000 m

distance travelled in 20s to 30s
s = v×t = 300×10 =3000m

so, total distance travelled in 30s = 4000+3000=7000 m = 7 km◆

Thanks.