Question

A motorboatstarting from rest on a lake accelerates long straight line at the rate of 2 m/s^2for 20 sec. How far the boot travelled during this time.( )
A)100m
B)200m
C)300m
D)400m​

Answer 1

Answer:Given,

Boat acceleration, a=3ms

−2

Time, t=8sec

Apply kinematic equation of motion.

s=ut+

2

1

​

at

2

s=0+

2

1

​

×3×8

2

=96m

Hence, boat travel 96m

Explanation:

Answer 2

Answer

D) 400m

Step by step Explanation

s=ut + 1/2at^2

where, s = distance

u = initial speed = 0 (as starting from rest)

a = acceleration = 2m/s^2

t = time = 20s

s = 0 + 1/2*(2*20*20)

s = 20*20

s = 400m