Question

You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. Assuming that your average acceleration was 30 km/h/h, how fast were you running when you arrived?a) 15 km/hb) 20 km/hc) 25 km/hd) 30 km/h

Answer 1

correct option is C i.e. 25 km/hr

Step-by-step explanation:

given data:

Initial velocity u = 10 km /h

acceleration a = 30 km/h^2

time = 30 min = 1/2 hr

we know from equation of motion, final velcoity is given as

final velocity = initial velocity + at

v = u + at

putting all value from above to get the final velocity value

v = 10 + 30* (1/2)

v = 25 km/hr

so correct option is C i.e. 25 km/hr