Question

II. A car starts from rest and
accelerates uniformly to a speed
Soms over a distance of 250 m.
The speed of car is
increased to 60 ms within
10s, if the acceleration is
further increased. Find this
acceleration and the
distance travelled by car in
10 S.​

Answer 1

V=at

⇒8=a10

⇒a=0.8m/s2

V2=U2+2as

⇒U=82+2×a64

⇒a=2×64−64=−0.5m/s2

Distance travelled= Area of graph

⇒584=21×10×8+8×t1+21×16×8

⇒584=40+8t1+64

⇒8t1=480

⇒t1=60

Total time= 10+60+16=86s