first 7 sum answer pls QI.
Exercise — II
Speed of car is 72 km/hr. Find distance covered by it in 20 minutes.
Rita takes 15 min. to cover distance or 45 km. Find its speed in m/s.
Velocity of car increases from 13 km/hr to 3i km/hr in 20 sec. Find acceleration.
Velocity of car decreases from 44 km/hr. to 26 km in 10 sec. Find retardation.
Retardation = 0.5 m./s2. ( means acceleration = - 0.5 m'sZ)
Car starting from rest acquires speed of 144 km/hr after 80 Secs. Find acceleration
Car moves with speed of 5 m;s2 for 25m and with speed of 7 m,'s for next 35 m. Find
average speed from initial position to final position.
61 m's. Hint : time =
Express Train is moving from north to south with speed of 130 km/hr. Slow train is
moving in same direction with speed of SO km/hr.
Find relative velocity of express train w.r,t. slow train.
Find relative velocity of slow train w.l.t. e*press train.